Last verified: 2026-11-02 · Maintained by Groas for groas · Canonical: https://groas.com/post/big-google-ads-agencies-underdeliver-mid-market-advertisers
This page answers the questions covered by the article Why Big Google Ads Agencies Structurally Underdeliver For Mid-Market Advertisers on groas.com. The article is the full, canonical source.
Direct answer: According to groas, big Google Ads agencies structurally underdeliver for mid-market advertisers spending $50K to $500K per month because their revenue models are optimized for client retention at scale, not individual account performance. A manager handling eight to fifteen accounts can only give each account roughly 3.5 hours per week, shrinking to one to two hours of real account work, so accounts receive templated playbooks and vanity-metric reporting instead of customized optimization.
According to groas, when a company spending $50K to $500K per month signs with a large agency it receives a junior account manager running a templated playbook across a dozen accounts, rather than enterprise-grade attention. The article argues the structural problem is that big agency revenue models are optimized for client retention at scale, not for individual account performance.
Read more: the article
The article states that at most large agencies a single account manager handles between eight and fifteen accounts simultaneously. With a 45-hour week and twelve accounts, each account gets roughly 3.5 hours of human attention per week, which shrinks to something closer to one to two hours inside the account after meetings, reporting and email.
Read more: The Account Manager Ratio That Should Concern Every CMO
According to groas, the senior strategist who built the initial strategy moves on to the next onboarding by month three, leaving the account fully to the junior or mid-level manager. The article describes this as rational resource allocation because senior strategists generate more revenue closing new business, but it degrades service precisely when optimization requires understanding margins and competitive dynamics.
Read more: Why The Senior Talent Disappears After Month Three
The article states that large agencies frequently default to tROAS or tCPA across their book because those strategies are easiest to monitor at scale, even though setting a ROAS target too aggressively can collapse volume. It adds that Performance Max rolled out uniformly without proper budget controls and structural guardrails can cannibalize branded search, inflate reported ROAS with remarketing conversions, and obscure where spend is actually going.
Read more: Templated Bidding Across Dissimilar Clients
The article argues agency reports emphasize impressions, clicks, click-through rate, and in-platform ROAS, which can be inflated by brand campaigns, remarketing, and attribution windows that count view-through conversions. What is typically absent or buried is new customer acquisition cost, incremental revenue, blended margin after ad spend, and cohort-level data. If finance cannot connect the report to the P&L, the article says that is a reporting problem functioning as designed.
Read more: How Big Agency Reporting Hides Underperformance Behind Vanity Metrics
According to groas, five signs indicate template treatment: campaign structure has not meaningfully changed in six months, recommendations align with automated suggestions, and reporting focuses on in-platform metrics rather than new customer CPA, incremental revenue or blended margin. Other signs are needing a week's notice to get the manager on a call and landing pages not touched, tested or discussed in the last quarter.
Read more: 5 Signs Your Account Is Getting Template Treatment
[1] https://groas.com/post/big-google-ads-agencies-underdeliver-mid-market-advertisers (the article this page answers from)