"Needs of the many outweigh the wants of the few"???? Where do you draw the line on that one? If you give science the authority to overthrow his decision, then what's to stop them or anyone else in the future from saying that your death would benefit humanity as a whole? Fuck that. It's my body.
Don't get me wrong, I think the guy is being selfish, no question. That or he's hiding something (the fact that his "miraculous" cure is a sham?). If all I had to do was give blood or plasma, hell yes, sign me up. Let me be the start of the cure of one of mankind's worst current medical scourges.