i don't buy it. my gut feeling is that loss in number of donors due to incentive to sell will be completely offset by lowering the barrier to giving your blood.

i don't buy it. my gut feeling is that loss in number of donors due to incentive to sell will be completely offset by lowering the barrier to giving your blood. companies fighting for customers and public image will start charity programs where some % of sold blood will be donated. there are just many more ways in which blood would be donated into the system with open market than with the closed one.