Anyone have any experience with selling plasma?

Well, you know you’re a college student when…You seriously consider selling plasma for some cash. This isn’t something I really think I want to do (or could do for that matter) but I am curious as to what the experience feels like. I’m not sure I could handle the whole blood being circulated back into your body thing. Does it feel weird/gross/uncomfortable? Does it hurt? How much do you really get paid after one session? Do you have to do more than one session? I read somewhere that once you got started you were kind of expected (but not forced) to come back in a month later. Any information about the procedure is appreciated!