I donated blood for many years, starting the first day I was allowed (mom took me). I’ve been an organ donor from the day I was able and am loud about that. And for a few months after college I sold plasma for money. It definitely felt scummy, but I think it’s ultimately a good thing, though it is selling part of your body to a for profit company at a rate that’s pretty bad. So the cons are really that it definitely feels seedier than whole blood donation and that the phlebotomists are worse. I can’t donate blood anymore because they gave me a track mark and I can’t risk my other elbow’s veinous access.