7 Mistakes Ecommerce Brands Make When Hiring a Google Ads Agency

TL;DR

Hiring the wrong ecommerce Google Ads agency can burn through your ad budget faster than almost any other marketing mistake you can make. Unlike SEO, where bad work wastes time, bad paid search management wastes real dollars every single day your campaigns are running. This post breaks down the seven most damaging mistakes ecommerce brands make when hiring a Google Ads agency and what to look for instead so you can find a partner who actually drives profitable growth.

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Why Hiring the Wrong Google Ads Agency Is One of the Most Expensive Mistakes You Can Make

If you’re running a direct-to-consumer ecommerce brand, you already know how brutal the pressure is to grow revenue while keeping acquisition costs in check. You’re juggling product launches, inventory management, seasonal planning, and probably three other marketing channels that all need attention. At some point, you decide it’s time to bring in an expert to manage your Google Ads, because you know there’s money on the table and you don’t have the bandwidth to capture it yourself.

So you start looking. You get on a few calls. Agencies throw around terms like Performance Max, Smart Bidding, and “guaranteed ROAS.” They show you dashboards that look impressive. They tell you what you want to hear. And because you’re overwhelmed and need help, you sign… no questions asked.

Fast forward 90 days, and you’re staring at a credit card statement, wondering where $15,000 went. The reports show clicks are up, but revenue is flat. You ask your agency what’s going on, and the answer is always the same: “We just need more budget.”

Sound familiar? If so, you’re not alone. It’s a scary place to be and I hear some version of this story on almost every call I take with a potential client.

I’ve touched on this dynamic in my posts about hiring an ecommerce SEO agency and SEO scams, but the stakes with Google Ads are even higher. With SEO, bad work costs you time and opportunity. With paid search, bad work costs you real cash, every single day your campaigns are running. That’s money straight out of your bank account that you’ll never get back.

I wrote this post to help you avoid that. Let’s walk through the seven most common, most expensive mistakes ecommerce brands make when hiring a Google Ads agency, and what you should be looking for instead.

The 7 Biggest Mistakes Ecommerce Brands Make When Hiring a Google Ads Agency

The biggest mistakes I see ecommerce brands make when hiring a Google Ads agency include choosing based on credentials instead of results, hiring generalists who don’t understand ecommerce unit economics, accepting misaligned pricing models, and giving up control of their own advertising data. Let’s unpack each one.

Mistake #1: Choosing an Agency Based on Their Google Partner Badge

This is one of the most common mistakes I see, and I get it. Google literally puts a badge on the agency’s website that says “Google Partner” or “Google Premier Partner.” It looks official. It feels safe. You assume it means the agency has been vetted and approved by Google.

Here’s the reality: the Google Partner badge is primarily a spend threshold. It tells you the agency manages a certain volume of ad spend and that their team has passed some Google certifications. What it does not tell you is whether they’re any good at driving profitable results for ecommerce brands.

I’ve seen plenty of Google Premier Partners run cookie-cutter campaigns because they follow Google’s own playbook to the letter. And here’s the thing most brands don’t realize: Google’s account reps, the ones who “help” your agency optimize your campaigns, are essentially inside sales reps. Their job is to get you to spend more money on Google’s platform. That’s not the same thing as helping you spend profitably.

What to look for instead: Ask the agency to show you case studies from ecommerce brands in your revenue range. Not impressions. Not clicks. Revenue, ROAS, and customer acquisition cost. If they can’t produce that, the badge means nothing.

Mistake #2: Hiring a Generalist Agency That Doesn’t Understand Ecommerce

This one hits close to home because it’s one of the main reasons we chose to specialize in ecommerce at Stryde. I’ve seen it play out dozens of times: a D2C brand doing $1-15 million in revenue hires a full-service agency that also manages Google Ads for dentists, law firms, and SaaS companies. The agency knows how to set up a campaign, sure. But they have no idea how to think about your business.

Ecommerce Google Ads is a completely different animal. You’re not just running text ads to a landing page. You’re managing Shopping feeds with hundreds or thousands of SKUs. You’re segmenting campaigns by product category, margin tier, and bestseller status. You’re dealing with seasonal inventory shifts where a product that’s your top seller in October is out of stock by November. You’re running dynamic remarketing to people who viewed specific products but didn’t buy.

A generalist agency typically doesn’t know how to:

• Optimize a product feed for Google Shopping (titles, descriptions, custom labels, GTINs)
• Segment campaigns by margin tier so you’re not spending the same amount to acquire a $25 sale as a $150 sale
• Handle seasonal inventory without tanking campaign performance
• Set up proper remarketing audiences based on product views, cart abandons, and past purchases
• Structure Performance Max campaigns with intentional asset groups instead of dumping the entire catalog into one catch-all campaign

I recently spoke with a home goods brand doing about $2 million in annual revenue. Their agency had them running one broad Shopping campaign covering all 800+ SKUs with the same bid strategy across everything. Their $12 throw pillows were getting the same ad spend as their $250 accent chairs. They were hemorrhaging money on low-margin products that would never generate a positive return, while their high-margin products were being starved of budget. A generalist set that up. An ecommerce specialist would never let that happen.

What to look for instead: Ask the agency how many of their clients are ecommerce brands specifically. Ask them to walk you through how they would structure Shopping campaigns for a brand with your catalog size and product mix. If they can’t get specific about feed optimization, margin-based segmentation, and seasonal adjustments, they’re not the right fit.

Mistake #3: Accepting Percentage-of-Spend Pricing

This is a big one, and it’s something I feel strongly about.

The most common pricing model in the Google Ads agency world is percentage of ad spend. Typically 15-25% of whatever you spend on ads goes to the agency as their management fee. On the surface, it sounds fair. You spend more, they do more work, they earn more. Right?

Wrong. Here’s why this model is fundamentally broken for ecommerce brands:

• It incentivizes wasted spend. If your agency makes more money when you spend more on ads, their priority becomes pushing your budget higher, not necessarily making it more profitable. That’s a conflict of interest, plain and simple.
• It penalizes efficiency. Let’s say your agency does amazing work and figures out that you can generate the same revenue with $12,000 in monthly ad spend instead of $20,000. Under a percentage model at 20%, the agency just went from earning $4,000/month to $2,400/month. They literally made less money by doing a better job for you. Think about that.
• You pay more without getting more. When you scale your ad spend from $10,000 to $25,000, the management work doesn’t necessarily increase by 2.5x. The campaigns are already built. The strategy is in place. But your agency fee just jumped from $2,000 to $5,000. For what?

This is exactly why we use a flat monthly fee model at Stryde. Our fee stays the same whether you’re spending $5,000 or $50,000 on ads. That means our only incentive is to make your campaigns as profitable as possible, not to push your budget higher. Our interests are 100% aligned with yours.

What to look for instead: Ask any agency you’re evaluating to explain their pricing model and, more importantly, what incentives it creates. If their revenue goes up when your ad spend goes up, you need to understand how they manage that conflict of interest. A flat fee or value-based model eliminates it entirely.

Mistake #4: Not Demanding Full Access to Your Own Google Ads Account

I cannot stress this one enough. If you take nothing else from this post, please take this: you should always own your Google Ads account. Always.

Some agencies create campaigns under their own MCC (My Client Center) and don’t give you admin access. They’ll send you reports, sure. But you can’t log in and see what’s actually happening inside the account. You can’t see the search terms report. You can’t see how much of your budget is going to branded vs. non-branded terms. You can’t see which products are eating spend without converting.

And here’s the worst part: if you leave that agency, you lose everything. All the campaign history. All the conversion data. All the audience learning that Google’s algorithms have built up over months or even years. You start from zero.

A fashion brand came to us last year after leaving an agency they’d been with for 14 months. They asked for their Google Ads account and were told, “The account belongs to us. You’ll need to set up a new one for you.” Fourteen months of conversion data, audience signals, and campaign optimization, gone. They had to start completely over. Their first 60 days with us were spent rebuilding what should have been theirs to begin with.

What to look for instead: Before signing with any agency, confirm in writing that you own your Google Ads account with full admin access (this goes for all Google properties: GA4, Search Console, Merchant Center, Tag Manager). You should be able to log in at any time and see everything. No exceptions. If an agency pushes back on this, that tells you everything you need to know. Walk away.

Mistake #5: Optimizing for Clicks and CTR Instead of ROAS and Revenue

This is the paid search version of the vanity metrics problem I’ve written about in SEO. And honestly, it might be even more dangerous here because there’s real money attached to every click.

Here’s what it looks like: You get your monthly report from your agency. Clicks are up 30%. CTR improved from 3.2% to 4.1%. CPC dropped by $0.15. It all looks great on paper. But then you check your Shopify dashboard and revenue from Google Ads is flat or down. What happened?

The agency optimized for engagement, not revenue. They got more people to click your ads, but those people weren’t buyers. Maybe they broadened your targeting too much. Maybe they’re bidding on informational keywords that drive traffic but not purchases. Maybe they’re running Performance Max with no audience signals, so Google is showing your ads to anyone and everyone.

For ecommerce, the metrics that actually matter are:

• ROAS (Return on Ad Spend): Total revenue from ads divided by total ad spend. This is the north star.
• Cost Per Acquisition (CPA): How much it costs to acquire one paying customer through ads.
• Revenue from Paid Search: Absolute dollars generated, not percentages or indexes.
• New Customer Revenue vs. Returning Customer Revenue: Are your ads actually acquiring new customers, or are you paying to re-acquire people who would have bought anyway?

A baby products brand we took on was paying their agency $4,500/month for management and spending about $12,000/month on ads. Every monthly report showed improving click metrics. But when we dug into their account during a free audit, we found that 40% of their ad spend was going to branded search terms, meaning they were paying for clicks from people who were already searching for their brand by name. Those customers were probably going to buy regardless. Strip that out, and their non-branded ROAS was below breakeven. The “great results” the agency was reporting were largely an illusion.

What to look for instead: Demand that your agency’s reporting leads with revenue, ROAS, and CPA. Clicks and CTR are supporting metrics, not headline metrics. And always ask for a breakdown of branded vs. non-branded performance. That single report will tell you more about the real health of your campaigns than anything else.

Mistake #6: Falling for “Just Increase Your Budget” When Results Plateau

This is the paid search equivalent of an SEO agency telling you that you “just need more backlinks.” It’s lazy, it’s a cop-out, and it’s a massive red flag.

Here’s how it usually plays out: Your campaigns performed well for the first few months. Growth was steady. ROAS was solid. Then things start to level off. Maybe ROAS dips a little. Revenue plateaus. You ask your agency for a plan, and the recommendation is: “We need to increase your ad budget to reach more people.”

Now, there are situations where scaling budget is absolutely the right move. But it should never be the first recommendation. Before asking for more money, a competent agency should be exploring:

• Search term reports to identify and eliminate wasted spend
• New ad creative and copy testing to improve conversion rates
• Landing page performance and whether the post-click experience is converting
• Product feed optimization to improve Shopping ad quality and relevance
• Audience refinement and segmentation to reach higher-intent shoppers
• Campaign structure changes like breaking out top performers into their own campaigns

Budget scaling should be the reward for proven efficiency, not a substitute for strategic thinking. The best agencies exhaust every optimization lever before recommending increased spend. If more budget is the only card your agency plays, they’ve run out of ideas.

What to look for instead: When results plateau, your agency should come to you with a specific diagnosis and a plan. “We analyzed the search terms report and found 15% of spend going to irrelevant queries. We’re adding negative keywords and reallocating that budget to our top-performing product categories.” That’s a plan. “Spend more” is not.

Mistake #7: Running Google Ads in a Silo, Disconnected from Every Other Channel

This last one is more subtle, but it’s a mistake that costs ecommerce brands a lot of money over time.

Most brands I talk to have their Google Ads managed by one agency (or person), their SEO by another, their email by another, and their social ads by another. None of these people talk to each other. They’re all optimizing their own channel in isolation, which means they’re duplicating effort, cannibalizing each other’s results, and missing massive opportunities to work together.

Here’s what integrated paid search management should look like for an ecommerce brand:

• High-converting paid search terms get fed to your SEO team as organic keyword targets, so you can eventually capture that traffic without paying for it.
• SEO content that’s ranking well and driving engagement gets used as landing pages for remarketing campaigns, instead of sending every ad click to a generic product page.
• Email captures the 97% of traffic that doesn’t convert on the first visit, so your paid acquisition cost gets amortized across multiple purchases, not just the first one.
• Google Ads audience data (who’s converting, what products they’re buying, what their LTV looks like) informs your Meta targeting and creative strategy.

A pool company I spoke with was spending $18,000/month on Google Ads and $8,000/month on Meta with two different agencies. Neither agency knew what the other was doing. They were both running retargeting campaigns to the same audiences, which meant they were bidding against themselves and driving up their own costs. When we consolidated their paid strategy, we reduced total ad spend by 22% while increasing revenue by 15%. That’s what happens when channels talk to each other.

What to look for instead: Ask the agency how their Google Ads strategy connects to your other channels. If they only talk about Google in isolation, they’re managing a channel, not growing a business. The best agencies think about your full acquisition ecosystem, not just the platform they happen to manage.

Questions You Should Ask Before Signing with Any Google Ads Agency

Once you’ve narrowed your list, here are some additional questions to help you make the final call:

Can you share case studies from ecommerce clients with measurable revenue results?

Not impressions. Not clicks. ROAS, revenue, and CPA. If they can’t show you these numbers, they don’t track them.

How do you structure Shopping and Performance Max campaigns for brands with my catalog size?

This question separates ecommerce specialists from generalists immediately. Listen for specifics about product segmentation, custom labels, and asset group strategy.

What does your pricing model look like and what incentives does it create?

Flat fee vs. percentage of spend is a critical distinction. Make sure you understand how their model affects their recommendations.

Will I have full admin access to my own Google Ads account?

Non-negotiable. If the answer is anything other than “yes, absolutely,” move on.

What does your monthly reporting include?

Ask for a sample report. It should lead with revenue and ROAS, include a branded vs. non-branded breakdown, and come with strategic recommendations, not just data.

How do you handle it when results plateau?

You want to hear a detailed process for diagnosis and optimization. If the answer is “increase budget,” you have your answer.

How does your Google Ads strategy connect to SEO, email, and other channels?

Even if they’re only managing Google Ads, they should be thinking about how paid search fits into your broader growth strategy.

Finding the Right Google Ads Partner for Your Ecommerce Brand

At the end of the day, choosing a Google Ads agency isn’t just a media buying decision. It’s a strategic growth decision that directly impacts your bottom line every single month. The wrong partner burns through your budget and leaves you with nothing to show for it. The right partner becomes an extension of your team, obsessively focused on driving profitable revenue.

By avoiding these seven mistakes, you’ll save yourself thousands of dollars in wasted ad spend, months of frustration, and the headache of starting over with a new agency that has to rebuild everything from scratch.

If you’re ready to see what an ecommerce-focused Google Ads partnership should actually look like, schedule a free audit. We’ll walk you through your current account, show you where money is being wasted, and give you a clear picture of the opportunities you’re leaving on the table, whether you work with us or not.

Frequently Asked Questions

How much should I budget for Google Ads as an ecommerce brand?

It depends on your product margins, average order value, and growth goals. Most D2C brands we work with invest between $3,000 and $30,000 per month in ad spend, plus $3,500-$6,000 for agency management. The key is making sure the math works based on your unit economics before you scale.

What’s the difference between Shopping campaigns and Performance Max?

Shopping campaigns give you more control over bidding, segmentation, and search term visibility. Performance Max is Google’s AI-driven campaign type that runs across Search, Shopping, Display, YouTube, and Discovery. Both can work well for ecommerce, but PMax requires intentional structure and strong audience signals to perform. A single catch-all PMax campaign is not a strategy.

How long does it take to see results from Google Ads?

Unlike SEO, Google Ads can generate traffic and sales quickly, often within the first week. But true optimization takes 30-60 days as Google’s algorithms learn from your conversion data. Expect the first month to be a testing and data-gathering phase. Sustainable, scalable results typically emerge in months two and three.

Should my Google Ads agency also manage my SEO?

Ideally, yes, or at minimum, your paid and organic teams should be in close communication. High-converting paid keywords should inform your SEO content strategy, and strong organic pages can serve as landing pages for remarketing. When paid and organic work together, acquisition costs go down and total revenue goes up.

How can I tell if my current Google Ads agency is doing a good job?

Start by asking for a branded vs. non-branded ROAS breakdown. Then check your search terms report to see what queries are actually triggering your ads. If you can’t get access to either, that’s a problem. I also wrote a companion post about how to measure Google Ads results that walks through the full reporting framework.