But what if we could we increase the amount of blood someone can donate. I know something roughly similar is done when donating marrow. What if we could augmen

But what if we could we increase the amount of blood someone can donate. I know something roughly similar is done when donating marrow. What if we could augment humans to be able to produce absurd amounts of blood and make it so it was a full-time job for those people? If we could increase the amount of blood someone could donate by 100x, would it start to become cheaper to just hire full-time donors rather than deal with all the expenses around donations? And would it be ethical even if the donors we're fully consenting and paid a good salary? Like you said, its a interesting hypothetical to say the least!