They have non-guaranteed contracts, meaning they could be cut at any time, only the top-tier players get substantial guaranteed money in their contracts, and th

They have non-guaranteed contracts, meaning they could be cut at any time, only the top-tier players get substantial guaranteed money in their contracts, and their average career length is two years shorter than a baseball player and a year shorter than a basketball player. You are, however, more likely to become an NFL player than an MLB, NBA, or NHL player.