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Rain comments on People who want to save the world - Less Wrong
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Until I explicitly asked for it, this was certainly true for me. The Red Cross thanks me and provides gifts or status boosts more than 12 times, in person, on each individual visit to donate blood, sometimes doing so in a public forum. SIAI doesn't even send an automated email any more.
I find it annoying when the Red Cross calls me, even when it's just with thanks, but part of why I've given blood in the past is that there's a plaque on the wall in my grandma's house of a newspaper clipping in which my grandfather is praised for exceeding the (I think) 10-gallon mark of blood donation.
Human blood has very low iron content by weight -- it is measured in micrograms per deciliter.
I was also disappointed when I learned that the process of extracting the iron is nontrivial.