This is a nice idea, but I feel that they will face the same problems as reddit, except that the users will be extra angry because their money is involved. Good luck to them.
Maybe it would help to have a Real Name tag like Amazon.
This was just to test out phil's bookmarklet.
(it works -- thanks phil!)
Cool site. Are you affiliated with them?
have you heard of marketocracy? I know they have been around for a while.