Theoretical question regarding organ transplant

So let's say you have two healthy working kidneys. And you're rich, filthy rich. Is there any advantage to hiring a medical team to implant a third healthy working kidney in you? I mean, if two work well, will three work even better? Would this give you extra protection against your bad dietary and drinking habits? Is there no advantage? Or would it even make things worse for you? Are there any organs that you would be better off having more than the usual allocation of?*

* There is no prize for being the first person to respond with "penis."

via International Skeptics Forum https://ift.tt/Ngd2r0D