The cost of maintaining PokerStars Pros in all of the continents must be serious cash, even for a successful site like PS. The conditions of being a PokerStars Pro are likely to change and frankly the expectations of certain poker pros are also subject to change, so there will always be good poker players moving from site A to site B for a broad variety of reasons.
No matter what reasons surface in the future for Greg Raymer's move from PokerStars, most people wish him well.
The current flotilla of arrogant poker-punks that theoretically make for good press might be cost effective, but I cannot shake the feeling that PokerStars is not valuing the importance of having all of the Main Event winners on permanent staff, and that is probably a mistake.
The best way to prove this is a mistake is for Greg Raymer to win the Main Event ... again
Good luck for the future Mr. Raymer.