Everyone is paid, except one

In the Journal of Medical Ethics, a call for a market in human organs:

There is a lot of hypocrisy about the ethics of buying and selling organs and indeed other body products and services for example, surrogacy and gametes. What it usually means is that everyone is paid but the donor. The surgeons and medical team are paid, the transplant coordinator does not go unremunerated, and the recipient receives an important benefit in kind. Only the unfortunate and heroic donor is supposed to put up with the insult of no reward, to add to the injury of the operation.

We would therefore propose a strictly regulated and highly ethical market in live donor organs and tissue.

They probably mean "regulated" as coercive, but it can be read as voluntarist by the anarchist.