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Why Your Facebook Ads CBO Is Stealing Your Budget
Description
Campaign Budget Optimization — CBO — was supposed to be Meta's gift to advertisers. Let the algorithm shift spend toward the winning ad sets automatically. But in practice, CBO often does the opposite: it funnels budget into high-spend, high-frequency ad sets that have already peaked in performance, starving newer creative or audiences that could actually convert. In this episode, Lucas walks through the math of how CBO's internal pacing algorithm works, why it favors the ad set with the highest historical spend rather than the highest incremental return, and why his own tests showed a 22 percent higher cost per acquisition after turning CBO on for a consistent campaign. Luna pushes back on whether the problem is CBO or bad campaign structure. The hosts walk through a simple fix: using ad set spend limits as guardrails rather than letting the algorithm run wild. Specific numbers, real campaign screenshots described aloud, and a takeaway that rethinks Facebook's own recommendation.