That would actually be an interesting idea for a social news site, partnering with companies to give away schwag to users who hit certain karma thresholds. I wonder what would happen.
Seriously though, you could probably do it without karma farmers if you announced a free X for all users currently over a karma threshold. Could be a cool tool for building social news sites & there are all sorts of companies that want to give away their stuff - magazines.
Hey Joel, any chance of a HN-karma-based lifting of the 2-person limit?
Say >1000 Karma and you can use more people?