No GW stores here in North Carolina, but the hobby stores that are here get overrun by a group of around 6 or so 12-year-olds. One hobby store was imho shut down because the little kids with their screaming and argueing and running around in a closed space scared away the customers (it was a general hobby store, not just 40k.)
When the gaming groups moved over to a different hobby store, it was about a month before the little kids struck again, driving away the adults who couldn't stand them, luckily the owner stepped in soon to alleviate the problems, told the parents to stop treating the store like a day care. 'Course, the store shut down later due to the owner having to move north to take care of his parents.
Luckily, a new store opened up recently, and the kids haven't arrived yet. hallelujah.