Earlier quoted context omitted.
> Sure, you're never going to know exactly how many people you advertised to would have organically, eventually found your product and bought it. But that honestly doesn't seem that important compared to the other metrics... Wait, why wouldn't that be important? It seems like the most important question since it asks whether advertising has any significant impact at all.
The thing about the "advertising doesn't matter" argument is that there are situations where advertising absolutely matters - when a company is just starting out and there's no way they can get organic referrals, when the public is unaware of their existence, etc. Moreover, most companies started small at some point so advertising and maintaining advertising made sense up to a point. And if we look at those companies…
The real problem is that for large companies with brand awareness they're starting to find a lot of their spend may not be generating revenue. Ebay in the Freakonomics podcast turned of about $100M in ad spend with no loss of revenue. But smaller, companies usually don't have the staff/knowledge necessary to know how and where to use their ad dollars.