Are you so stupid that you don't know what you need?
You might be surprised at how many people are that stupid. Henry Ford sold his Model T automobile to people who thought they needed a faster horse.
Do you need help when deciding what food/clothes/housing/car you buy?
Some people do. In some categories, U.S. consumers can rely on Consumer Reports, a product comparison magazine and website funded by subscribers that takes no advertising. But a lot of things are so hyper-local that a nationwide magazine such as CR can't cover them adequately, such as restaurants and housing. And even then, CR somehow needs to learn that a particular product exists and is available to the public, even though it refuses to take product samples.