I like the idea. My intuition says that 1:1 transfers are best to get closer to a monetary system. The ring up voting is a problem because it creates value out if nothing. I think I would distinguish between karma that is spend on upvotes and Karma that is transferred. The idea being that you can not spend karma that was used to upvote. Maybe the default could be that half goes to the upvote and half to the account—but maybe you can split up differently. This would recover your 1:2 effect.
I like the idea. My intuition says that 1:1 transfers are best to get closer to a monetary system. The ring up voting is a problem because it creates value out if nothing. I think I would distinguish between karma that is spend on upvotes and Karma that is transferred. The idea being that you can not spend karma that was used to upvote. Maybe the default could be that half goes to the upvote and half to the account—but maybe you can split up differently. This would recover your 1:2 effect.