I don’t see how that would still be secret. As soon as you find out you’ve been cheated, you’ll come out. Unless you are too embarassed.
But I suppose if someone is stupid enough to ignore a guy telling you not to give him money, and you give him money anyway, but make it so secret nobody even knows you gave him money, and there is no legal record that you gave him money, so no way for you to get it back, I’m not sure that I am going to feel all that sorry for that person.
On the other hand, it’s the perfect conspiracy theory — “See, he’s taking money by fraud, but he’s doing it by telling people NOT to give him money, which makes some people so crazy they FORCE him to take the money, but it’s all so secret that nobody can possibly know about it. Except me, of course, and you since I’m telling you about it, and of course all our readers. But don’t expect any proof, because I just told you it’s a complete and total secret so nobody knows.”
A key to most good conspiracies is something that can be entirely explained in a way that the explanation also perfectly explains why there is no evidece of the conspiracy.
“Unless you are too embarassed.”
That is the first defense in the con.
Here you can read all about cons:
http://money.howstuffworks.com/con-artist.htm