I've sold my sabres tickets on there for 6-7 years, though I find that I can get more for certain games using stubhub and end up spending a lot less time doing it. I did get someone that was bent out of shape that I wouldn't take a check, then came back with cash and was mad that I couldn't make change. There was also one person that was particularly upset that I wouldn't sell him just one ticket. I told him that it was the only time that anyone had ever asked for a single ticket, so it was unlikely that a second friendless person was going to also want one ticket to the same game.
I tried selling corals on CL once. I got calls from two goofballs and pulled the ad down. One of them turned out to be someone that occasionally posts here and has sold at swaps :/