Your description, "hefty people sitting at tables surround by colored dots," made me laugh out loud. Last summer, I attended my first marble show in Tacoma, WA. I brought along my two teenage sons, trying to interest them in the hobby, etc. My sons gazed around the room and commented on the "hefty", older, mostly balding guys sitting at tables around the room, then looked at me and said, "Dad, you've found your place--you fit right in."