I wasn't fully aware of this rule.
One year while attending our convention I was sitting on a bench outside the room before it opened with a few of my albums/boxes open... Needless to say, I was swamped with questions and proposals and started selling like there was no tomorrow; in front of everyone and all seemed okay.
About after an hour of the room opening and sales slowing down, I decided to go inside in search of treasure and, in doing so; I walked passed Al Rollins' corner table and noticed one of his two tables not being used. When I asked Al why, he said it's for those who might wish to trade. I made Al an offer for that table and opened up shop.
At one point I remember Archie walking over to Al with a smile and remember nothing more other than me asking Al if everything is okay, and he said yes... There were several other passers-by who utilized a portion of the table to display their open albums and traded... It was one healthy, active stall and I think everyone involved was happy. I know I was. Every year following, I would take Al out to dinner during his visits to F.U.N.... May he rest in peace.