So Iran is the only country in the world that legalized the sale of kidneys, and as a result, they don't have any wait lists for kidneys. Regardless of how you feel about it, it's an interesting case study (from an anti-imperialist nation to boot) about the effectiveness of the system: https://en.wikipedia.org/wiki/Kidney_trade_in_Iran
Of the donors 76% agreed that kidney sale should be banned and if there was another chance they would prefer to beg (39%) or obtain a loan from usurers (60%) instead of vending a kidney. The goals of vending were achieved not at all by 75% of donors.[5] However another study has been more positive, with 86.5% of donors reporting "complete satisfaction" prior to discharge, and only 1.5% reporting regret.[6]
This is a huge disparity and makes me think something else weird is going on.