Asklemmy

In the past, I’ve had my local hospital call me asking for a blood donation, for example, because of an upcoming surgery of a hospitalised kid that shares my blood group. I got money for that too.

In the US, AFAIK you can't get paid for whole blood. If you did, you would have to be paid significantly more than they pay for plasma, given that you can only do whole blood every two months.

To the question, it's not a "scam" by any conventional definition. You are getting real money in return for the plasma.

The problem with the whole system is that if there was no payment for plasma, there wouldn't be nearly enough people donating plasma for the need that there is. (You're typically looking at 1+ hour per session, 2x/week.) That doesn't include whatever travel time is involved. That's a pretty steep time commitment every week for something that's a very nebulous public good.

I think a better question is, is the amount that you're being compensated fair and reasonable? Give the profit margins that are involved in products made from blood plasma, my inclination is that it is not a fair and reasonable amount. Plasma centers in my area vary in how much they pay, but it's typically in the neighborhood of $50-$75 (USD); in other parts it's lower, and in some areas it's significantly higher. It's clear that they can pay more, but choose not to because it increases their profit margin. That is something I have a problem with.