Earlier quoted context omitted.
I would think they could just screen frequent donors with rare blood types for infections. Once the donor is known safe, compensate however is needed to get their blood. I believe there are private industries doing this. This one will be opening soon in my town, though I guess just for plasma: http://www.biolifeplasma.com/become-donor/compensation.html
I'm a regular whole blood and plasma donor and I'm quite sure that I'd be much less likely to donate if I was being paid for it. I'm not really sure exactly why I feel that way, but I guess that if you put a dollar value on it I'd be calculating whether it really was worth my time. Right now, because there is no compensation (aside from a muffin and a cup of tea afterwards), I get the emotional benefits of having per…
The donor wouldn't have to also be "donating" gas money, just blood and time.