It’s not always like that and you are removing agency from the person purchasing the product.
No. _history has unequivocally proven_ that people are inherently stupid and end up buying things they will regret. Or at least they should, if they were aware of the full extent of damage typical products cause.
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.