I can't help it, and maybe I don't want to stop! I remember when I was a child, I was a girl scout (the whole brownie and junior girl scout thing) and I absolutely LOVED collecting the badges from projects that I earned. I thrived on it. I remember delving into the book o' badges to see badges would be "low hanging fruit" for me. See, if I knew I had to do 4 things and I've already experienced 2, let's knock those others out and get...that....badge! And yes, I still have my girl scout sash somewhere!
I suppose collecting the bling from races is similar. I don't much care for the shirts (except maybe the Florida Road Race Series) and most of the stuff at the expo I typically don't use...but its the bling that I like. Just looking at it is satisfaction of my effort.