It's hard because extrinsic motivation kills intrinsic motivation (see Drive for some of the behavioural science here). Once you start putting a monetary reward

It's hard because extrinsic motivation kills intrinsic motivation (see Drive for some of the behavioural science here). Once you start putting a monetary reward on things, people in general lose the interest in doing them for their own sake. So I think for this to work, you have to go full collectivist: gather up a bunch of people interested in different things, produce stuff for each other and divide equally with no money being involved in the transaction.