I sold my body to science to get a kilt.

[mudd]

Here in the UK blood is donated for altruistic reasons.

Yes, that's how it works here in the US too. We donate whole blood for medical needs.

The selling of plasma is a different thing and is done through pharmaceutical companies. They use the plasma for things like extracting clotting factor or, in my case, extracting tetanus anti-toxin.

And, by-the-way, this must date me, because I only got $20 a week when I did it.