My dad has a friend try to talk him into amway sometime in the late 80s/early 90s. He had painted a pyramid shape onto cinder blocks in his basement to explain the revenue stream and everything.

He said no, but that friend ended up high enough in a payment chain that he’s still rich as sin, and my dad got to be one of the scant few that turned down what would’ve actually been a lucrative business venture in a pyramid scheme.