By Muslim 
For the European e-commerce sector, the digital landscape has shifted from a fertile ground for growth to a challenging environment defined by tightening margins and escalating acquisition costs. According to a comprehensive new analysis by Channable, a Dutch e-commerce feed management specialist, the cost of doing business on Google’s dominant advertising platform has reached a critical inflection point. As click costs climb and returns dwindle, retailers are being forced to rethink their digital strategies from the ground up.
The recently published eCommerce Google Ads Benchmark report paints a sobering picture: between June 2024 and June 2025, advertisers across Europe faced a 15% increase in cost-per-click (CPC), alongside a catastrophic drop in Return on Ad Spend (ROAS) exceeding 40%. For many brands, the "pay-to-play" model of Google search is no longer yielding the predictable growth it once promised.
Analyzing the 1.38 Billion Euro Landscape
The data underpinning these findings is substantial, providing a granular view of the European e-commerce market. Channable’s analysis covers 1.38 billion euros in verified ad spend across more than 10,000 individual advertisers. This massive dataset allows for a bird’s-eye view of how Shopping and Performance Max (PMax) campaigns—the bread and butter of modern online retail—are performing in a volatile economy.
The study confirms a year-on-year surge in CPC across all major campaign types. While a 15% increase in CPC might seem manageable in isolation, the cumulative effect of a 0.06 euro rise across millions of clicks creates a significant dent in profitability. When this cost inflation is compounded by a simultaneous decline in conversion efficiency, the impact on the bottom line is profound.
Chronology of the Decline: A Year of Shrinking Margins
The data reveals a clear trajectory of degradation in ad performance over the past twelve months.
Q1 vs. Q4: The Seasonal Squeeze
The disparity between the first and fourth quarters of the year highlights the aggressive nature of the current market. CPCs in the final quarter of 2024 were 9.1% higher than in the first quarter of the year. This inflationary pressure is mirrored in total advertising expenditure, which spiked by 47.9% during the Q4 peak—the period encompassing Cyber Week, Black Friday, and the holiday shopping rush.
The data suggests that the "holiday premium" is no longer just a budgetary consideration; it is a structural barrier. Retailers are finding that they must allocate nearly 50% more capital just to maintain a competitive presence during the year’s busiest shopping window.
The Performance Max Discrepancy
Performance Max (PMax) campaigns, which were touted as the future of automated, AI-driven advertising, have faced particular scrutiny in this report. While Standard Shopping campaigns saw a 43% decrease in average ROAS, PMax campaigns performed even worse, suffering a 46% decline.
The decline in PMax efficiency is particularly troubling for stakeholders who invested heavily in Google’s automated bidding and placement algorithms. The data suggests that this drop is not merely a product of rising click costs, but a result of a 0.11% decrease in conversion rates—meaning that even when consumers click, they are less likely to finalize a purchase than they were a year ago.
Supporting Data: The Anatomy of the Profitability Gap
To understand why ROI is collapsing, one must look at the interplay between cost and conversion. The "Performance Gap" identified by Channable is driven by two primary vectors:
- The CPC Inflationary Spiral: The 15% increase in CPC is a reflection of increased competition and the rising cost of prime search real estate. As more retailers flock to Google Ads to compensate for declining organic traffic, the bidding environment has become increasingly saturated, driving up the cost for every single visitor.
- Conversion Decay: The 0.11% drop in conversion rates within PMax campaigns suggests that the "audience quality" provided by automated Google systems may be shifting. If brands are paying more for traffic that is less likely to convert, the inevitable result is a sharp reduction in ROAS.
When these two factors are combined, the result is a "scissors effect"—the cost of acquiring a customer is moving upward while the revenue generated per customer acquisition is moving downward, effectively cutting the profit margin from both ends.
Official Perspectives: Shifting from "Budget" to "Infrastructure"
The implications of this data have sent a ripple through the e-commerce sector. Stefan Hospes, Co-founder and Chief Product Officer at Channable, believes that the problem is as much philosophical as it is technical.
"The brands feeling this most acutely treated Google Ads as a budget line when they should have approached it as key data infrastructure," Hospes remarked in the report. According to Hospes, the industry has fallen into a trap of complacency. Many retailers simply mirror their strategies from the previous year, assuming that if they bid on the same keywords with the same settings, they will achieve the same results.
"A 15% CPC increase is painful if you are bidding on the same listings as last year," Hospes explained. "It is manageable, however, if your feed is optimized, your budget is structured for Q4, and your product data is working as hard as your campaigns."
Hospes’ commentary points toward a necessary evolution in e-commerce marketing: moving away from "set and forget" automation and toward highly granular, data-driven optimization. In his view, the brands that succeed in this new climate are those that treat their product feed—the raw data that tells Google what to sell and to whom—as a strategic asset rather than a technical necessity.
Implications for the Future of Retail Advertising
The findings from the Channable report have long-term implications for how European retailers manage their digital presence.
1. The Death of Automated Complacency
The poor performance of PMax campaigns suggests that AI-driven automation is not a substitute for human oversight. Retailers who rely exclusively on Google’s "black box" algorithms without providing high-quality, enriched product data are seeing their returns erode. Moving forward, marketing teams will need to invest more time in feed quality, negative keyword management, and bid strategy refinement.
2. Diversification Beyond Google
The 47.9% spike in Q4 ad spend highlights a dangerous dependency. When the cost of visibility on a single platform increases by nearly half during the peak season, brands that rely solely on Google are left vulnerable. We can expect to see a shift toward multi-channel strategies, where retailers invest more heavily in social commerce, email marketing, and organic SEO to insulate themselves from Google’s volatile auction environment.
3. Margin Protection Strategies
With ROAS dropping by over 40%, many retailers will be forced to reconsider their pricing strategies. If customer acquisition costs continue to rise, companies will either have to accept lower margins or pass the costs on to the consumer. This may lead to a reduction in promotional activity, as retailers realize that deep discounting on products—combined with high ad costs—is a recipe for financial instability.
4. Data-Centric Maturity
The future of e-commerce advertising lies in the ability to bridge the gap between product data and campaign performance. Companies that integrate their inventory data, margin data, and customer lifetime value metrics directly into their bidding structures will gain a competitive advantage. Those who continue to treat Google Ads as a simple "traffic tap" will find the tap increasingly expensive and the water increasingly thin.
Conclusion: Adapting to the New Reality
The era of easy growth on Google Ads has clearly come to a close. The 15% rise in CPC and the drastic decline in ROAS are not merely temporary market fluctuations; they are indicators of a maturing market where competition for digital shelf space is reaching an all-time high.
As the Channable report illustrates, the brands that survive this transition will be those that stop treating digital advertising as a commodity and start treating it as a sophisticated data ecosystem. By optimizing product feeds, structuring budgets for volatility, and moving away from passive reliance on automated tools, retailers can reclaim their margins.
For the European e-commerce sector, the message is clear: in an age where the cost of visibility is rising, the value of precise, intelligent, and data-backed execution has never been higher. The retailers who succeed will be those who recognize that the game has changed, and who have the agility to evolve their infrastructure to meet the demands of a high-cost, high-competition future.
Suro Senen 
Dwi Wanna 
Basiran 