In fairness, I think those schools came into the ACC, knowing that it was a very NC centric conference. Just like if you join the Big 12, you are joining a Texas-based conference.
There's NC-centric, and then there's holding the tournament in Greensboro 5 times in 6 years, which will be the case by 2015. Despite being Texas-centric, it might surprise you to know that in its 16 years of existence the Big XII tournament has only been held in Texas 3 times. Of course it's been held in KC 11 times, so they aren't exactly a good example either...but they also aren't the ACC when it comes to hoops.
Not that the ACC needs to grow its brand, but I just think it would be a good thing to take the tournament to some of these new areas in the footprint. The new additions open up an opportunity to get your product in front of potential new fans. They did it several years ago in Tampa, but other than that, a couple times in Atlanta and DC are the only places outside of NC it's ever been. New York would have been awesome, but I know it was their choice not to bid, rather than the ACC turning them down. Boston or Chicago would be cool. I'm sure they wouldn't have to do much arm-twisting to get a lot of fans to travel to Miami. If the elected leaders in Baltimore/Maryland can ever get that proposed arena past the concept stage and get it built, having the tournament there would be amazing for the city. I'd be curious to know what cities actually did bid?