Ecommerce PPC Case Study: How a Small Retailer Grew Revenue 47% in Two Months
Restructuring an inherited PPC account and cutting wasted spend with negative keywords turned a struggling channel into a healthier, more profitable one.
Quick summary: In this ecommerce PPC case study, a small, family-owned online retailer grew PPC revenue 47% in two months and cut cost per conversion 16%, beating its own cost goal, by restructuring an underperforming account inherited from a previous agency and implementing a disciplined negative keyword strategy.
Introduction
This ecommerce PPC case study looks at a small, family-owned online retailer specializing in girls’ toys and collectibles. The business was a genuine passion project for its owners, but the paid search account behind it wasn’t performing anywhere near its potential. The owner came looking for two things at once: more revenue, and a lower cost to get it.
The Challenge
Before this engagement, PPC revenue made up 44.08% of the business’s total revenue, and the owner wanted that number to grow, not just in dollars but as a share of the business overall. She had a clear, specific goal in mind: a cost per conversion between $25 and $30 in Google Ads. She was coming from a previous PPC firm and was, in her own words, desperate to see both real growth and a healthier return on what she was spending.
Where the Account Started
The account itself wasn’t broken. It was fully functioning and had been running campaigns for a while. But it wasn’t built to direct traffic to the right areas of the site, and it had no real negative keyword strategy in place, which meant budget was quietly leaking to clicks that were never going to convert. A technically “working” account and a well-structured one are not the same thing, and this was a clear example of the gap between the two.
Our Strategy
Restructuring around what the business actually needed
The account was reorganized to better reflect which areas of the business needed the most attention, rather than treating every product category the same way. This gave the budget a clearer job to do instead of spreading it thin across everything at once.
Negative keywords to stop the bleeding
Putting a real negative keyword list in place was one of the most immediately impactful changes. It filtered out unwanted traffic that had been eating into the budget without ever converting, which improved both traffic quality and conversion rates almost right away.
The Results
Revenue climbed every single month, and it climbed faster than the traffic driving it, meaning the account was converting better, not just spending more to generate more clicks.
Key results at a glance:
- PPC revenue grew 47% in two months, from $6,567.07 in September to $9,677.27 in November
- Cost per conversion dropped 16%, from $25.97 to $21.83, landing below the client’s own $25 to $30 goal
- PPC’s share of total business revenue climbed from 44.08% to 70.55% over the same three months
- Improvements were driven by account restructuring and negative keywords, not increased ad spend
- Gains compounded month over month rather than happening all at once
PPC revenue grew every month, for a 47% increase from September to November.
Cost per conversion fell from $25.97 to $21.83, beating the client’s own $25 to $30 goal.
PPC grew from less than half of total business revenue to more than two-thirds of it in three months.
What Business Owners Can Learn
- A PPC account that’s technically running isn’t the same as one that’s well structured. “Functioning” and “effective” are two different things.
- Negative keywords are often the fastest, cheapest lever available to improve an underperforming account, since they stop budget leaking to traffic that was never going to convert.
- Revenue growth and lower cost per conversion aren’t a trade-off when the underlying problem was efficiency, not budget size.
- Tracking PPC’s share of total business revenue, not just raw ad revenue, is a useful way to see whether a channel is becoming a bigger, healthier part of the business.
- Real improvement tends to compound over two to three months rather than happening in the first thirty days. Judging a new strategy too early can be misleading.
Frequently Asked Questions
How do negative keywords improve ecommerce PPC performance?
Negative keywords block ad spend from being wasted on searches that look relevant to Google’s matching system but aren’t actually relevant to what’s being sold. In this case study, adding a negative keyword list to an existing account filtered out unwanted traffic almost immediately, which improved conversion rates and made the account more profitable without increasing the budget.
What’s a healthy cost per conversion for ecommerce PPC?
It depends heavily on product price and margin, so there’s no universal number. In this case study, the client set a goal of $25 to $30 per conversion based on her own margins, and the account ultimately beat that goal, reaching $21.83 per conversion. The right target should come from your own numbers, not an industry average.
How long does it take to fix an underperforming PPC account?
Meaningful improvement can start within the first month, but the biggest gains tend to compound over two to three months rather than happening all at once. In this case study, the first month after restructuring showed real but modest improvement, with the largest revenue gains arriving in the second and third months as the account continued to be refined.
Should I switch PPC agencies if my account isn’t performing?
Not necessarily right away, but it’s worth having someone else audit the account first. In this case study, the client arrived with a fully functioning account from a previous PPC firm that simply wasn’t structured to direct traffic to the right areas of the site or filter out unwanted clicks. The fix wasn’t a bigger budget. It was better structure.
Final Thoughts
None of this came from spending more. It came from making the existing budget work harder, through structure and negative keywords, and giving the account a few months to compound instead of judging it after the first thirty days.
If you’re not sure whether your own ecommerce PPC account is structured to actually work, that’s exactly the kind of question a Competitive Marketing Analysis is built to answer. It’s free, it takes a real look at where you stand, and there’s no pressure attached either way.
