>>922iirc only one donation is allowed per person, total.
but I'm not 100% certain. all I know is that the amount of money one can get for donating sperm is so minor as to be totally insignificant.
on top of that, I considered donating blood recently. only worth $10, and will only be allowed to do it once every time interval (I forgot, but basically not often enough to justify the price of gas to drive the 20 miles to the nearest blood bank).