I will try! The biggest problem will be to get the incentives right

I've always thought it would be an interesting twist on the upvote mechanism to allow users to "spend" their karma. So if I receive three upvotes, I can spend three upvotes by either upvoting three stories once, or upvoting one story three times.

At least with downvotes and bounties, that's how it works on the StackExchange sites