I totally know these guys.
We can't really classify them as people who have lots of things for the actor's to sign because, being the fanboy I am, the last time I met Kevin Cahoon, I had two playbills, a poster, and a CD slip for him to sign, haha. (And when I met Anthony Rapp, I'm sure he was annoyed by the four items I had for him to sign, and I still feel bad about that but..)
I've encountered some really nasty guys who do this. Outside the Wedding Singer SD, there was always this man who'd be smoking a cigar with three Wedding Singer posters with him. He'd shove the marker in everyone's face and not even say one word to them.
The worst pair I saw, though, were two huge Asian men. It was outside Mary Poppins, and they creeped me out badly. They stood there with there posters, and shoved the marker in the two young kid's faces! After they practically forced these kids to sign their posters, they said "picture!" and just stood next to them with blank expressions on their faces. I guess this was proof that they had it signed if they wanted to sell it on ebay.
REALLY creepy.
Call me Travis. :)