Only a very small part of advertising is actually product promotion. Coca-cola spends $4 billion a year on ads, do you think it's because otherwise no one would know that coke exists?

It's true that advertising is a great way to promote a product, but its far from the only way. For many years now I've done what I can to cut all advertising out of my life and yet I still buy lots of things, including things I've never seen a single ad for.