At Fantasy Camp, they have one evening for the former pros to sign stuff. It's quite the sight to see grown men lined up with stuff for them to sign. They are very patient, I think, it's not their favorite thing obviously. I got a couple balls signed for this kid I know, and a bat, but most of these guys are more friends now than idols.
Some of the campers, a few, go way over the top with cards and whatnot. It always strikes me as, well, a bit odd, but whatever.