I don’t doubt that in some situations, when everything else is primed - the product is good, the market is there, and awareness is the only thing lacking - advertising can make a difference.
For every anecdote like your friend’s, though, I can produce a hundred where millions just went into a hole for absolutely nothing.


Sure, transactional SEM either works or it doesn’t and you know if it does. Brand marketing and advertising is a completely different ballgame. Being at the top of the searches when people are buying your product type is one thing. Buying a Super Bowl ad is another.