I used to get dragged into this conversation all the time. I've never seen one scrap of evidence in these schemes at all. It is illogical. Consider this:
A) If they *want you* to make money, why do they charge you for the information?
B) If they want to make money for *themselves* why are they telling the world?
C) If they want *you* and *them* to make money then A+B
Always does it for me...sort of like Edwin's without the switch statement, but more about the motivations.
Years ago there was a scheme that my friends brother was getting involved in called Swiss Cash. You deposited money and you got an increasing balance, all looked good on the screen until it came to withdrawing the money. He [brother] was emphatic that it was for real and lost ££££'s, I tried everything - bar - locking him up to stop him, but he still did it. Desperation is a terrible thing and those that prey on the desperate should be treated as vermin. It's not always a lack of intelligence either, just sometimes a willingness to trust....after all we hand out money over to countless institutions and expect to get the money back.