All studies from countries where organ vending has occured (legal or illegal) concludes that while the recipient, broker, and surgeon/hospital fare well, the living donor/vendor/seller does not. Physical complications, psychological/emotional consequences, financial constraints (due to the aforementioned) and reduced quality of life.
Ghods, Naqvi & Moazam are just a few of the authors of these studies.
PS. As I'm sure you're aware Sherri, the 1972 end-stage renal disease act gave a Medicare benefit to living kidney donors. Unfortunately, it was never implemented, and it is now denied. There are a couple of transplant coordinators that are fighting to obtain the benefit for specific living donors who have suffered complications (sorry, can't give you more info than that)