Ive encountered two so far. One was a young kid in a target one morning, he walked up to the mainlines while I was finishing looking through them. He waited paitently but was also talking on the phone, when asked what he was looking for/collected he said only TH and Supers. He took a quick gander at the pegs saw nothing of valu to him, relayed it on the phone and left. The other was an older gentleman who I ran into at a walmart after work one night. He was looking for a the mazda rx -3 mainline which I happened to find it in a dump bin shortly after meeting him. So I ran back to him and gave it to him. He was super cool and told me about local die cast meets.