That's exactly it. I'm proud when I go and donate and I get to show the staff at the end my card that says I've donated 47 times. I spoke with a Canadian Blood Service staff member once and she said that people compete all the time. You can donate plasma (or platelets) every 2 weeks, so people use that to pad their numbers.

Except we now live in the Internet age...where nothing happens unless you can post it on Twitter or Facebook.