Truth, assuming that the SG story as we know it is correct, I agree.
Yes, it would hurt the forums by losing active posters, but it would also raise credibility.
Scammers inflict some SERIOUS damage on books through this crap. I don't have any examples, but I'm sure that being scammed has been a big part of the failure of some books.
Throw in the fact that a scammer probably lets his "buddies" in on his game via the forums, and it's that much worse.