That isn't the question. Do you think it is ethical to allow an entity to be able to legally gain access to another persons organs for monetary gain?
Here is a hypothetical situation: Say a person has an affair, and having it get out would be the worst thing that could happen to them.
A party that needs an organ for either transplantation/experimentation, or that needs a subject for a biomedical experiment contacts them and threatens to inform his/her spouse unless they give up one of their kidneys or subject themselves to a biomedical experiment.
They say that you would get paid good money...your spouse wouldn't know, and...you have two kidneys and can function just fine with one.
To the legal authorities, this is an otherwise perfectly permissible transaction. Is it ethical to allow people to get into this situation? If not, how would you prevent it?
Extortion is not "a perfectly permissible transaction" in any country developed enough to even think about trying to regulate biotech and medical research. But should a researcher be allowed to offer a poor person money or other needed medical treatments in exchange for allowing him/herself to be experimented on? Of course. Why should the government be allowed to set the poor person's priorities?