A question about High Stakes Pro's

[Action Scott]

This question was of discussion between myself and some of my friends at our weekly game. I always hear stories about the big time pro's (Brunson, Reese, Chan..whoever) playing in these extremely high-limit games (300/600, 1000/2000). My question is, if these guys are all sitting around playing against each other at these high-limits, how are any of them making any $money$ as a professional. Wouldn't they all just keep giving and taking and coming out about even? I can't imagine there to be too many fish at a 1000/2000 limit. Your responses are greatly appreciated. Maybe Sklansky himself would be the best one to answer this, but I would value any of your opinions.(I hope I posted this in the correct forum, it does say High Stakes). Thanks