I don't know if I'd call selling plasma a scam, but it doesn't really feel like a good thing either. I know people on a fixed income where this is one of the only ways they can make some extra cash, so I understand why people would do it.

Like, sure, you get money for your fluids that you'll replenish naturally and that has its appeal. But for a lot of people it's a slippery slope argument about what parts of your body you should be able to sell.

If you're economically depressed (the system is working as intended) then you might be tempted to start selling organs. Would you accept five figures for a kindey or cornea? Would you sell your heart or liver for six?

You might even be able to argue that it's a noble sacrifice to give your life to secure your family's comfort. But there's something to be said about being forced into that position in the first place.