How? I dont see how karma being money could work with downvotes. It only seems to work with up votes. The idea being that you give karma to another person by t

How? I dont see how karma being money could work with downvotes. It only seems to work with up votes. The idea being that you give karma to another person by taking it from your own stash. Up votes would cost you money. But how do downvotes work? Do you take another person's points away? That doesn't work because humans are greedy.