Players purse is larger than the Masters, PGA and British Open I believe. Definitely is a bigger tourney than every other non-major.
ETA: Webb has to have a borderline HOF career right now. A US Open, a Players Championship and 7 wins. 10 wins he becomes a lock. Very nice career for him.
It feels like he has won more than 7 times; Bill Haas has won 6. I agree with cville that he gets to 10. Excellent career for Webb.