I mean all things considered it isn't that crazy. Luck has made about 100M in the NFL. He's 29 and could have a long career as a coach or architect and have a very healthy nest egg to fall back on. Sure he's losing at least another potential 100M or more and that seems crazy to people like us, but not everyone needs to make all the money. He's made enough money to live extremely comfortably, and his kids and grandkids will be extremely comfortable. Luck is a Stanford grad, he's a few ticks smarter than the average NFL player. He knows what he's doing, he's leaving the game because he's tired of being hurt. Maybe he comes back in a few years, maybe he doesn't. Either way I'm sure he'll be happy with his choice.