They are the only one of the big four in the US with non-guaranteed contracts. And the one with players by far the likeliest to get badly hurt. Not to mention

They are the only one of the big four in the US with non-guaranteed contracts. And the one with players by far the likeliest to get badly hurt. Not to mention (1) many players don't actually get paid that well; (2) careers are often quite short; (3) unless you're a liar, you understand what happens when a player gets hurt but if they don't play, they don't get paid... Surprising no-one who doesn't work for the NFL, players play hurt. Or hide concussions.