CMV: Paid Plasma Donation Should Be Legal and Carry No Stigma.
Plasma is vital for medicine, used in a number of different therapies as well as given directly to patients. However, it takes a LONG time to collect, and it seems difficult to collect without compensating people for their time. The rules for donating are also somewhat restrictive. As it is the US, one of the few countries that allows donors to be compensated, exports 70 percent of their plasma.
It has a seedy reputation in the US but plasma donation centers, in my experience, tend to be fairly pleasant places with a wide variety of donors.
It is also something that easily and painlessly regenerates, unlike organs.