[Easy E]

One, tournament poker is a different kind of poker than cash games. They really shouldn't be considered the same "game."

Two, what makes you think that any of the top cash game players would want to give away their bread-and-butter by revealing their play? In tournaments now, they are forced to somewhat- however, since that's a different game, it doesn't affect their cash play in a largely detrimental way in my opinion.

Three, other than playing for ego, why would they want to take on the best players when they could make their regular big-game profits from playing a mix? That is, if the "big game" gets much of a mix.