Like the others I've only seen pay for blood plasma, not whole blood. Whole blood gets you a cookie, sometimes a sticker or a T-shirt, or once I got a $15 gift card but I'm pretty sure that was from the company sponsoring the charity blood drive and not the Red Cross who was collecting the blood.
And pay for plasma isn't a lot, like $30 a donation, 1-2 donations per week. You get more working a single shift at a fast food restaurant. Plasma also takes longer to donate than whole blood because you have to sit there while the plasma is separated out and the remainder pumped back into you.