Why Monthly Ad Spend Can Misstate Brand CAC
Siminoff argues that simple customer-acquisition calculations work best for directly attributable performance marketing. Brand advertising can keep producing sales for years, so dividing one month's spend by one month's buyers assigns a long-lived effect to an artificially short window.
- Brand demand persists after campaigns stop
- Monthly spend divided by monthly sales can overstate CAC
- Direct-response channels permit cleaner attribution
- Early category-building may be cheaper than fighting established competitors later
“if I stop all my advertising today,”
“are ringing sales still going to happen for the next one, two, three, four, five years? Yes. So then we'd have zero acquisition cost.”