"A Ponzi scheme is a fraudulent investment operation that pays returns to its investors from their own money or the money paid by subsequent investors, rather than from profit earned by the individual or organization running the operation." - Wikipedia
Assuming you want more money, you should avoid Ponzi schemes because you are more likely to lose money than to gain money.
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Oftentimes, though, early adopters into the Ponzi scheme can do quite well, especially if they become involved with the owner of the operation. They kinda remind me of payday loans: they're both total wastes of money.