Had I the funds, I would pay them for their gift, not becuase they should be paid, but as a small token of gratitude. I would hope they used the money for other selfless acts. Or for much needed help with whatever unfortunate situation they might be in today.
Should people be able to sell their own body parts? I say Yes, if it's an informed choice, and no life is threatened.
Shifting gears slightly....
Any elected official who just keeps complaining about Roe v Wade without taking action to overturn the case is wholly unqualified to serve in office, because he or she does not understand how laws work in this country. They need to draft legislation and see it enacted. Overturning Roe will require a State to enact legislation banning abortion. That law will make it's way to the Supreme Court, and the Court will render it's decision.
While Roe may have set a precedent, it was only binding on the parties to the case. States are still able to enact new laws on their own (see Amendment X), regardless of what SCOTUS says about prior laws. As personnel change on the court, so does the court's opinion change with time.
Why is it that women are not permitted to sell the sexual use of their vaginas but they can legally sell the reproductive use of it (harvesting eggs or a womb for rent)?
And why can’t I sell a kidney?
Walter Williams has raised this point a number of times in talk radio.
I haven’t heard from him in over a year. I don’t know if my city just stopped carrying his program or if he no longer has a show. He also used to sub for Rush Limbaugh but when people get picked up for syndication by competing outfits sometimes the never make it back to Rush’s sub list.
Never get between a man and his organ. Looks like he's quite content.

You don’t have to wonder what the answer is to that question.
A few years back, the government banned women from getting silicone breast implants, simply because there were some vague suggestions that the silicone could cause problems.
Women were forced to get less-capable saline implants.
All that was necessary was to tell women the risks of silicone, and let them choose what to do with their own bodies.
But NOW, NARAL, and the other liberal abortion groups didn’t raise a FINGER to protest women being denied their right to choose silicone breast implants.
Seems that when it came to protecting women’s right to choose, allowing women to kill babies was much more important than letting women decide what to do with their own bodies.