But let's not forget that these guys have a limit on how they can play with a strong body. They will retire at an early age, and they need all the money they can get to secure their retirement. Imagine not knowing any job and living in luxury, and then suddenly you lose the job that you have? Most people in the entertainment industry will suddenly get poor just after years of retirement.
In any sport, that's what a player thinks, or their managers. They want their players secured for a lifetime, and even as they grow old, they find them the best offer they can so that they can earn money from them and then secure them as well. Loyalty cannot feed you, and that's a belief from old age, not in this era.