Do you think it depends on the size of the show Chezzyr? By that I mean things like the Royal would be different?
I haven't been an official photog yet, but when I do the national, I have said I don't want anyone with pro equipment taking photos, but friends/other exhibitors is ok. This is mostly because most of my income will depend on the sales, so I can't have anyone else selling photos from there, or publishing them.