In The Jigsaw Man, and similar stories in that era of the Known Universe, organs are extracted so viciously because the rich can achieve near-immortality through constant cycling of damaged organs. Thus, the demand for organs by powerful people prompted an increase in supply by any means necessary.

In this kidney scenario, we're talking about introduction of capitalism into organ donation. The medical industry is already entrenched enough as it is into capitalism, fucking over real people because they can't afford healthcare, and this would bring it to a new low. Powerful people will already demand high prices for organs that were normally regulated with priority system that figures out who actually needs it the most, outside of class. As soon as we open this door, the economics will eventually force large classes of people to sell whatever extra organs they have to the rich just to survive poverty. Exploitation of the poor to benefit the rich in yet another way previously blocked to them.

I’m thinking you didn’t actually read the article.

I did not because it's an extremely stupid question. The answer is simple.