Two parts to this response:

1: my blog addresses the ethics of taking human tissue from the poor or middle classe to benefit the rich. I don't think you will find many CEOs lining up to sell their platelets, or plasma. But, when they get sick they certainly expect those blood products to be available. That may not be an issue for you. For me, it is an issue.

2: safety of a product cannot be guaranteed. Testing is not 100% (see here). People subject to regular infusions of blood products have higher rates of certain blood-transmitted diseases. Harvesting blood from populations where the diseases are more prevalent (the poor) means more disease factors will be in the blood.

Just a few things to think over :)