the amount of cheating in poker

[hot tub man # 1]

I've been fooling around on RPG a bit lately and keep coming across numerous posts about cheating. One former cheat, who doesnt appear to be too popular among the rest of the posters claims, there is cheating the majority of high stakes poker games. How can this be true if the same well known players, Hennigan, Forrest, Harmon, etc keep beating the games? How much card marking and collusion really goes on at the higher limits? Anyone have a good idea?

This same player also claims to be cashing out 5 figues a month playing online, so perhaps I shouldnt take his opinions so seriously.