Think he'd have played in the WSOP if there was a chance of not getting paid at the time?
Poker also works differently.....become a world champion and people line up to play you even. Win one tournament in pool, and your action is dead unless you want to give up the world.
gambling in pool is dead if it wants to be brought into the 21st century it needs corporate sponsership and having the title former US open champion might mean something if that ever happens like I sad if the 500 bucks isnt that important might be worth it to a young gun