Quoted from Rick432:
I'd consider posting pin-etiquette rules of one game per turn, etc.
It was alarming how many folks didn't follow these rules. By far the most irritating is leaving a game unfinished. You have to drain the balls and when someone else comes up and you are starting a new game, it appears that you are violating the "one game per turn" rule.
I think etiquette was far worse this year, but I also think that was a function of far fewer games to play.