Perhaps. I notice in most societies we say there are all sorts of things that you can’t do for money with your own time and body, however desperate you may be. Selling your organs and selling sex being examples.
Resulting in thousands of deaths due to organ shortages, and sex workers being abused by pimps and corrupt cops.
That illustrates fairly well why having an underclass who provides healthy organs to the rich is a utterly barbaric idea.
I don't have a strong opinion either way, but my understanding is that it's very very far from proven that legalizing prostitution improves the lot of sex workers -- I am led to believe that trafficking becomes _more_ of a problem in localities where sex work is legal.
Further, and again no strong personal opinion on the matter, but I suspect you'd see a huge rise in coerced organ selling if it became legalized.
These are questions societies need to answer for themselves, and my central point was that there's already precedent for societies deciding that they don't benefit when some things are available for sale, even if an individual in the moment says they want to sell it.