In general even if your donating the blood for free they will still charge the person who gets the blood thousands of dollars at least in the US. They might just bill it as the service of sticking the needle in and hanging the bag up for you or whatever, but in essence they do charge for the blood and make a profit off of it.

I do think its a good thing to donate and help people, but i also do think that companies take advantage of the situation to make a profit off of it, and it is definitely exploitation. Donating blood plasma specifically is not a fun process, and it can leave a permanent scar on your arm if done a lot. The pay for it compared to the problems, and the profits they make on it is definitely understandable to see as a scam.

Now is the answer to that to just let people who need blood die? Obviously no. The answer is the make laws that say companies must provide a fair market rate for peoples plasma if selling it, or ideally just make laws that make all healthcare free so its not an issue anymore.

I'm usually sitting or lying down.

Tissue, cell and organ donation (including blood, semen and oocytes) can and should be done strictly not-for-profit. This is how it's done in Spain (well, you do get a snack when donating blood and a small amount of money for oocytes since the process is quite long) and there's usually no shortage of blood components in hospitals. Local governments do a lot of campaigning, set up mobile units etc., which seems to work; people see all of that, think of it when planning their day, and many even go in small groups to donate.

Maybe it should be like other charitable donations and there should be a set tax deduction per ml or better yet how about they take enough for donation and decanter a portion out an do blood testing both to make sure the blood is clean but alsoso the individual is aware of they are free of X. You could get like a qr code you can use to identify the results later.

If it’s an adult doing the selling, then it’s a consensual interaction.

Exploitation in the negative sense requires a violation of consent.

How could selling something you naturally produce be a scam? I can see how easily you could get ripped off on the price, but in the end you're still making money and automatically replacing the plasma lost. Even if they're not actually using the plasma for their stated purpose, I'd still argue the donator is not the one getting scammed. I guess it really comes down to your definition of "scam".

I've donated blood and plasma and each time I've been offered rewards but don't bother claiming them. I do it to help others. My job pays me enough to live on.

I think it's fine to pay some for it.

I don't know how your healthcare system is structured. But let's assume there is a profit motive in getting you to donate blood. Let's also assume profit is a problem. So we want to reduce profits.

1. If you get €25 per donation that is €25 less profit for them per donation.

2. The demand for blood is going to stay the same. No one will decline a live saving surgery because it's a bit expensive and will pay anything to get it. Increasing supply will decrease profit margins.