Valve introduced a variant of this for Dota 2 recently. But they take a 50% cut. And it's more team based, than individual based. https://www.dota2.com/newsent

Valve introduced a variant of this for Dota 2 recently. But they take a 50% cut. And it's more team based, than individual based. https://www.dota2.com/newsentry/3066366095803889976 https://www.dota2.com/newsentry/3066366095803889976