When an outsourcer relies on in-house staff, it's already a touchy situation. When the outsourcer claims credit for the result, in-house staff have to play the game carefully in order to win
When forced to choose between a great job with good compensation and a good job with great compensation, choose the great job -- unless you really need the money
One reason: "Fair" is in the eye of the beholder, but the only stable situation is defined by the marketplace, which doesn't care at all about fairness