A pyramid scheme is a pyramid scheme, even if black-letter law pretends it is not. A lot of these will end up in the Liars category as well. You can read a commentary about multi-level marketing here. Some people are just stupid. Some are just bigoted and uninformed.
Some people naively believe and repeat the lies of others.
Some tell deliberate lies. The sites listed under this category belong to the liars. Nobody could continue to believe this crap, so by saying it they admit to being liars. Anyone listed here who objects to being called a liar can refer to the site philosophy page and see the options for complaint. This is where I put all those sites which don't fit somewhere else.