Many stars of "The Challenge" have taken to Cameo, the video-sharing platform in which fans can pay celebrities to record personalized messages, to make a few extra bucks. You can get a birthday greeting from contestant Devin Walker for $80, for example. Or perhaps a commiseration from quitter Beth Stolarczyk for the sum of $169. Or if you're prepared to stump up an extra six bucks you could even get seven-time winner Johnny Bananas wishing you a happy National Bubble Wrap Appreciation Day.

As you would expect, though, it's the MTV show's long-running host who will set you back the most. Indeed, you need to fork out a cool $225 for a message from TJ Lavin. But no doubt unlike most of his peers, the former BMX professional doesn't actually pocket the cash himself. No, in a sign that he's one of the good guys, Lavin donates every cent he makes from the platform to charity.

The star explained to Las Vegas Review-Journal, "It's just me. It's everything that I do. It doesn't have anything to do with a certain charity or a certain organization. I just spend the money on homeless people and giving it to people. Like, in Africa, for instance, I made about 6,000 bucks on Cameo, and I gave away about 7,000. So it was a very, very good time giving that money away."

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