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It depends on how you A) measure and B) define "success."
Brand recognition? Sales? Social engagement to the ad?

Anyways, it's a perennial problem for almost all ads since forever. Most businesses wish to believe there's a return in their investment, but know that marketing is as good as black magic. They hate spending money on it, but know it's necessary. And it always feel like throwing money down the drain.

I've played both sides of the field.