Also, when they inevitably get injured, they don't get paid. Srsly, if you are a die hard football fan and you don't think there is something really wrong with how players are treated, you are an ignorant, sadistic piece of human garbage.
How are they treated badly? Anyone knows that if you run full speed into another large object, you are going to get hurt.
They get paid very well. League minimum is $375,000 for a first year player for 2011.
If they do not like it they can quit and get another job. No one is forcing them to play like in the Roman gladiator times. They are making the conscious decision to pursue their WILLINGLY chosen profession.