I would have a hard time wanting to bring an expensive game in really nice shape to a show and I'm thankful that there are people willing to take that chance and share.
That being said, my Judge Dredd was used on the tournament lineup and there were some rage tilts going on with it during qualifying and it didn't bother me that much but only because it wasn't in pristine shape. If I had my TWD premium in there and people were doing that I'd probably flip out.
Etiquette videos/posters will only do so much because some people just don't have respect for other people's property and some people are oblivious. Tighten up those tilts and only bring what you are comfortable having possibly damaged or are not that emotionally attached to.