The biggest misconception about AI bidding

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• Part 1How Bad Data Corrupts AI Bidding and CAC Performance

  Up to 60% of paid clicks provide zero conversion value. Chester Scott, Chief Strategy Officer at Lunio, explains why clicks and ROAS both distort performance measurement and how they corrupt AI bidding decisions. The conversation covers the shift from ROAS to marginal ROAS as a North Star metric, isolating diminishing returns across channels, platforms, and audiences, and protecting automated bidding models from compromised leading indicators that inflate CAC.

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• Part 2What’s the most overrated marketing metric today?

  Click optimization remains fundamentally compromised as a performance marker. Chester Scott, Chief Strategy Officer at Lunio, challenges the metrics most advertisers treat as gospel. He explains why clicks function only as a leading indicator, makes the controversial case against ROAS as a North Star metric, and argues for a shift to marginal ROAS—measuring diminishing returns across channels, platforms, campaigns, audiences, and creative to drive overall effectiveness.

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• Part 3One thing marketers trust too much

  Clicks and ROAS remain the industry's most trusted—and most misleading—metrics. Chester Scott, Chief Strategy Officer at Lunio, explains why the North Star metric guiding most advertisers actually disguises the truth about channel effectiveness. He makes the case for marginal ROAS over aggregate ROAS to expose diminishing returns across platforms, campaigns, and audiences, and reframes clicks as a fundamentally compromised leading indicator rather than a signal of performance.

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  Part 4The biggest misconception about AI bidding

  Advertisers optimize for metrics that disguise the truth. Chester Scott, Chief Strategy Officer at Lunio, explains why ROAS—the North Star metric for most advertisers—undermines effective spend decisions across channels and campaigns. He makes the case for shifting to marginal ROAS to measure diminishing returns at the channel, platform, audience, and creative level, and reframes clicks as a fundamentally compromised leading indicator that should never drive optimization.

• Part 5One signal every marketer should pay more attention to

  Click optimization rewards a fundamentally compromised signal. Chester Scott, Chief Strategy Officer at Lunio, dismantles the two metrics most marketing teams treat as North Stars—clicks and ROAS—and explains why blended efficiency numbers disguise where spend actually delivers. He makes the case for marginal ROAS as the discipline that exposes diminishing returns across channels, platforms, campaigns, and creative, and reframes how enterprise teams should allocate budget for overall effectiveness.

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