Why do people hope that shows sell out?
I mean, who wants to be crushed up against an overcrowded drunken throng of drunken faux Irish dudes?
Personally, I always wish for half to three quarter filled shows that enable one to find good sightlines and room enough to stretch ones legs.
It's been 24+ hours that the NYC tickets have been on sale, and none of the three shows there have sold out. I wouldn't worry about camping out for tickets.