He might be on Youstake.com. There has been some controversy about how much some players, like Hellmuth are charging. A player with a good track record gets more than others. Some of Hellmuth's peers, like Shaun Deeb say he charges to much juice. I think Hellmuth gets around 150%, not sure.
I used to buy pieces of a few players at the World Poker Challenge at the Reno Hilton years ago. I payed 125%. I think it's fair for a player with a good track record to charge some juice because they are doing all the work. But the danger is players overselling themselves then intentionally knocking themselves out of the tournament. Eskimo Clark was known for doing it.