This obsession with measurable outcomes from online advertising – something it’s impossible to do with TV or print or billboards – is idiotic. Advertising is about brand/product recognition and building familiarity/trust as much if not more than direct sales, and always has been.
This is a solid overview of the issues. Maybe, one day, the industry will wake up to its idiocy. Yes, detailed data is useful – but just because some things are measurable doesn’t mean everything is. A sale may be a long time in coming.