Well there is definitely an art and science to marketing, but I think its a little bit cynical to state that people buy brand name products because they are being duped into it. There are a lot of good reasons for buying a name brand product. You pay extra for the consistency in quality and the dependability the the brand implies (or often expresses in writing).

The main thing is that we define a line in advertising that constitutes fraud, and provide harsh negative incentives to fraudulent behavior.