Sounds like an interesting concept - but I'll be curious to see how it fans out over time. There's a company in Gibraltar that's beta testing a new FPS game where you get cash (eventually turned into prizes) for damage you do to other people in the game.
Reading a bit more about it there seems to be a good foundation for a pretty neat concept...they've taken measures to try to group people of similar skill level together so there's not a repeat of the type of thing that happened to me for example at the Halo 3 Launch (I got beat by a bunch of younger kids in Halo 3).
Here's a link to the company's web site: http://www.kwari.com/ - have a look for yourself - enjoy!