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You could sell your plasma twice a week in the town I went to college. We also found that it took significantly less alcohol to get drunk if you had nearly a liter less plasma running through your veins, so it would also save us money in the evening!

You can donate every 3~4 days in the US? In France I believe it is only once every 2 months for men and every 3 months for women!

edit: confused plasma donation with blood donation; it is still only every 2 weeks for plasma donations over here

My understanding, at least where I live, Florida, is that plasma can be sold, but whole blood must be donated. I still get a $25-$35 gift card every time I donate a pint of whole blood (as close as possible to every 8 weeks).