Funny how many of them turned out to be complete criminals--Mt. Gox, pirateat40, and TradeFortress are the first ones I noticed. I don't recognize many of the other members, so they probably wised up and went elsewhere after realizing that bitcointalk has been infested with spammers and there's not much real discussion going on. Either that or they're so busy spending their millions that they have no time for discussion forums.
As far as I know, it's only proved that pirateat40 was criminal, but he was caught, and did 18 months in prison, so he probably does not have a millions, although maybe he could get rich after that, because to run such a scheme as he did you need to be at least an intelligent guy.
And as for the rest, Mt. Gox, and TradeFortress has not been proven to be scammers, but they are of course to blame that many people have suffered and lost a lot of money.