I like the idea, but it ultimately means that nerds who snort crank to play the game 24/7 will be the ones holding the majority of the coins. I may be slightly nerdy, but I don't have the time to spend playing games, and I'm going to become meth-head so I can stay up all night playing.
Then you do your day job and make money and pay the poor folk who don't have a day job so they sit around playing this game securing some coins.
A game that somehow was more than a waste of time would've been better though but also harder to make.
Still... protein folding comes to mind.
Then the poor people without a job could be making something useful and then you pay them for their time with your day job money and we all benefit with a better financial transaction system. ... aah utopian dreams.