I agree with your final statement with respect to cadavers, as well.

Someone has a rare condition that leads to some scientific insight that makes a researcher or company rich, and they get nothing. People make tens of thousands of dollars processing bodies for organ transplants, and the donor's family get a thank you note.

Let's not pretend that the medical tissue harvesting and usage system isn't for-profit. The only people not getting ahead in the process are the people literally giving of themselves for the sake of others.