zlacker

>>pg+(OP)
There is no scarcity with upvotes. If I have an infinite amount of money to spend, I will spend it without prudence.

Cap the number of upvotes that a user gets each day and give explicit feedback on how many upvotes that they have left.

>>pkaler+J2
Perlmonks does this, and based on your total karma you are given a higher daily limit to spend. Works quite well.