Here's what scares me about this. Once people start selling their kidneys for big bucks, that will create a market for kidneys which is fine and all. But that will in turn create a black market for stolen kidneys. At least it is that way for other big markets.
This just reminds me of that old urban legend about kidney theives stealing kidneys and leaving their victims in a bathtub filled with ice and a cordless phone...
http://www.snopes.com/horrors/robbery/kidney.asp