the last thing anyone should do is compare the world of elite athlete jobs with normal jobs. If I go to my competitor law firm down the street for more money, it isn't the same as going to a team where you will get paid but end up hating your job because you never win anything (remember sports is about winning).
I don't think winning is paramount in a lot of player's mind. It is secondary behind getting money.
I would guess a quarter of the players in this game are in it for the glory. The remainder would chase a check, mainly because they have to.
People are people, whether or not they are athletes or not.
Honestly, if I were in a profession where I knew I would likely have to start over in four-six years into a different life, I would milk it when I got that shot.