$10,000 for one pint of UNTAINTED blood

What if your body could naturally produce something, and you could sell it about once a month for $10,000. That’s not a theoretical question. I have a good friend who has O negative blood. That makes him a universal donor. But there’s one more thing - he refused to get the COVID vaccinations, and that’s another rare thing. But the combination of the two makes his blood the most desired blood in the world. Just a point of that stuff is worth $10,000 because people want it. I wonder why that is...