I will never understand why people don't use their brain, if something sounds too good to be truth why they think it is true? Why do they think that everyone is stupid and they are smart? They obviously think that money grows on trees.
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Oh there were so many books about that. Many people, well-educated, even not poor go into such investments. I will never forget the tears of my friend 20+ years ago when he lost all his savings (about 2k) in such "investment company". I think the reason is simple - money must come easy (reliable amount of them) and it is true that money must come easy. Law of Nature or something. And thefts are simply imitating this law in the pyramidal scheme.