The arrogance of people outside the industry saying that a many-billion-dollar market is "not effective" is... kinda ludicrous on here.

If you don't think it's right for them to exist, I'm not challenging that viewpoint at all. But coming in and assuming, with minimal to no research, that thousand of people and billions of dollars are pouring into complicated products which don't actually do anything, is a bit of an anti-vaxxer approach to the world.