... could be costly in the long run. The NFL has a problem -- which is news in and of itself for a league with ridiculous popularity and prosperity. Plain and simple: A lot of star players have been setting a bad tone with their teams this offseason. The looming threat of a lockout in 2011 looks like an obvious cause. You see, while no sport is immune to the occasional holdout story, the NFL seems to have been hit with a rash of superstars who, for one reason or another, have been absent instead of present. Let's take a look at the most prominent cases.

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