The thing is, the monetary incentive is necessary because there are not enough people donating - plasma, blood, whatever. So if that's what's needed to get people to donate (or whatever else word you want to use), then that's fine in my books. Both sides get something.

I get the idea of wanting it to be on donation-basis only, but people don't donate for free as often as when they do *get money. Because society is inherently selfish and doesn't care for the needs of others.

Again, the service the companies provide is directly beneficial to society. Yes, big pharma is a thing and medicine should be free. But what's not how things work. So what's the problem?