Edit: I do agree you should have a google-findable website which lists the objective characteristics of your product. If you call that advertising (I call it a "release", and I reserve the word "ad" for anything that has emotional appeal and caters to the indifferent/uninformed), then I agree.
You need someway to get whatever your selling into a place where people buy things
The seller knows how much effort/resources were put into the product, knows (or has enough resources to figure out) how to nudge/mislead the consumer, has teams of brilliant people working on that - see the ad industry. I would definitely agree that the consumer has some responsibility, too, to stay informed, and if it weren't for the fact that this causes externalities to society, I wouldn't give a crap about the fact that some corporate director was duped into buying a terrible product. Unfortunately, that causes companies that particularly good in misleading people to outcompete companies who spend their money elsewhere.