They have WIFI and I can check my e-mail and stuff one handed on my tablet during the donation process.
Personally, I'd rather flip burgers with a bunch of snot-nosed teens than sell my biologicals to some seedy plasma vampire clinic in a seedy section of town.
It's not that I feel bad for taking money, it's just the idea of selling a part of me for a couple bucks. It's like, ugh, I can't afford to eat today. Guess I better go sell a piece of my liver.