That's actually a pretty cool idea. Once there's infrastructure in place, it's easy to enforce, too. Turn in a paper and upon acceptance you are billed for the citations.
Money = reputation also kind of works and is a nice incentive to write good papers that get cited often.
[downside is obviously that it kind of also creates an incentive to cite less]
[downside is obviously that it kind of also creates an incentive to cite less]