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Capitalism is nothing but a giant pyramid scheme.
(infosec.pub)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
That's a good question. Amway is perhaps the architype pyramid scheme. They actually do sell products, but primarily to the marks they con into being 'amway agents' or whatever they call them. The marks, in addition to buying the shit, also kick back part of the proceeds from any sales up the ladder. A ponzi scheme doesn't actually do anything with the marks investment money other than use it to pay off the people in on the con.