What good is a blood donor?

Yesterday I had the privilege to hear a representative from our Community Blood Center here in Dayton, Ohio. She handed out a flyer with the following text on it:

A blood donor is good for people who go through windshields and red lights. For Someone with cancer, hemophilia, or anemia. Or hepatitis. Or ulcers. For people being operated on. For people into feudin' and fightin'. For people who are almost out of life because they are almost out of blood. For a little girl who doesn't know that leukemia has happened to her. Or why. For a little boy who needs something revved up that wound down. Like energy. For people having open-heart surgery. For people who need a blood donor and also an organ donor -- a part as well as a pint -- a new heart or new liver, a lung or a kidney. For new babies needing new blood. Or new mothers needing a transfusion. For little kids who get into something poison or fall onto something sharp. For people who fool around with something that explodes, goes off, bites or shatters. For people burned pretty bad. For daredevils. Tree climbers. For people at the wrong place at the wrong time. A blood donor is good for people who are in a lot worse shape than most people you know. Someone needs a lot of your blood a lot.

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What are your reasons for not being a regular blood donor? I will be eligible to donate again the first or second week in October.