Creative fatigue is not an inconvenience; it is a recurring line item that erodes margin on a predictable schedule. A practitioner who tracked spend across individual ads observed exactly how different the cost curve looks depending on which creative is in rotation: “Creative A hits $5 on Day 7.” [Q1] “Creative B hits $5 on Day 21.” [Q2] That three-week gap between two ads reaching the same cost threshold is not a minor variance. The unit economics of each asset are structurally different from launch, and the account pays that difference whether the operator notices or not.
What makes the cost easy to underestimate is that the damage often arrives quietly.
One practitioner who manages campaigns at scale put it plainly: the real test of competence is not what happens when “Shopify is green, ROAS is good and the campaign is printing,” [Q3] but what happens when creative fatigue starts. Knowing that fatigue is coming, knowing that different assets carry different cost trajectories, and understanding what that differential actually costs the account before the decline is visible: that is the economic work the job requires.
The diagnostic question to apply to your own account: if your current top-performing creative fatigued tomorrow, do you know whether your testing budget has been priced to absorb a Day 7 ceiling or a Day 21 one, and do you know which one you are actually buying?
Confidence 88%
Scored against the cited record — claims the evidence didn't support are refused, never softened into a hedge.