I think there should be a different system, where Karma is "invested" in the posts you make, and you lose maybe 5 Kara when you post but if 6 people upvote it, you will gain that one Karma and the user would choose how much Karma to invest, and the more Karma invested the higher it appears on the page. There would need to be a slightly higher starting Karma though, but it would be interesting to see how and if it works out.