Okay. I didn't realize they never did. I've heard of places paying for blood, didn't know what those places are. That's just weird.
When I was in college, I vowed never to give blood to a certain local hospital's blood drives. I'd given blood a number of times to the Red Cross and not had a problem (other than people assuming that I'm anemic or terrified when I go to give blood, due to my very light skin color). I had given blood a number of times and was pretty comfortable doing so.
First, they refused to take the blood from my left arm and insisted on doing it from my right. Why? Because the chair they'd assigned me to had the (movable) arm rest on the right, and they didn't feel like moving it. I always prefer my left because it's my non-dominant hand, and because it has a large and highly visible vein right at the elbow that everybody finds very easy to stick. But, they insisted on my right. Well, my right doesn't have a nice clear vein like that. It has a branch of them near the elbow, and they're all fairly small. So they told me I had bad veins on that arm and that they'd probably end up collapsing one, but they'd go ahead and give it a try anyway. (They didn't agree to my suggestion of switching to the left arm.)
Then, after they did manage to stick the needle in, the guy realized he needed something under my chair in order to finish the process. So, with his hand still holding the needle in my vein, he leaned forward to dig under my chair for whatever it was. What tends to happen when you lean forward? Yes, you put some weight on your hand as you lean in. So he shoved the needle deeper into my arm. And of course then it wasn't in the vein anymore, so the bleeding slowed. Which apparently was my fault, because he kept trying to fix it, and he and his coworkers kept coming by and checking the blood flow and telling me that I just wasn't bleeding fast enough, and this was taking FOREVER. In a tone that implied that I should somehow fix this. The needle hurt constantly, and every moment it was in. That had never happened before.
Anyway, the experience was so awful I went back to my dorm and cried and cried. This was as a 21-year-old who was experienced at giving blood. I stopped giving blood for years after that, I just couldn't stomach it. If that hospital can't train their staff better than that, they don't get my blood. Ever again.