Welterweight champion Georges St. Pierre reportedly received a $500,000 bonus and a Hummer when he knocked out Matt Hughes at UFC 65 in Sacramento, Calif.

Additionally, fighting in the UFC makes an athlete significantly more attractive to a sponsor. Frank Mir made $85,000 for the logos he wore into the cage for his fight with Brock Lesnar that night. Had he been fighting in another organization, there's zero chance he would have earned half that in sponsorship money and he likely wouldn't have gotten 20 percent as much.

So Mir that night earned a base pay of $40,000, a win bonus of another $40,000, a submission of the night bonus of $60,000 and then hauled in $85,000 in sponsorship dollars.

He's not going to be able to retire after that bout, but bringing in $225,000 for one night's work isn't bad at any time, especially in this economy. A fighter like Chuck Liddell is making around $6 million a year between his salary and his sponsorships and was making at least $9 million little more than a year ago. He was getting $75,000 a month from Xyience and received $1 million for just two weekends of promoting the movie, "300."

"The UFC will pay you if you perform," said fighter agent Dean Albrecht, Mir's agent. "It's like in the NFL. They're not going to rip up your contract after one great game, but if you perform over a period of time, they'll pay you and pay you extremely well. In the UFC, if you go out and fight and put on a great show, believe me, they pay extremely well and they can make some of these kids rich."