I do in fact sit down for an hour once or twice a month to give plasma without compensation and many other people do so as well, given that it’s illegal to be paid for blood or plasma here in the Netherlands, but I can see why paying people a bit would help.
The reason people can’t get paid for it here is to avoid perverse incentives, mainly people donating when they shouldn’t, lying on the form or to the doctor to pass the pre-donation check.
I got a teddy bird and a puzzle! Worth it.