Living in NC, I know numerous kids who are currently at App State or have graduated from App and I’ve never once heard a complaint about that school, never heard of anyone I know transferring out. They have tons of school spirit. Conversely, every kid that I’ve known over the years who has gone to Coastal, has transferred. It could be that Coastal ends up not being appealing for NC/SC kids compared to other in-state offerings? IDK. Maybe it’s close proximity to the beach is more appealing to students from northern states?
Toured CofC with my older daughter. Although Charleston is lovely, the campus and dorms were run down and my daughter wanted also wanted football and a big sports culture 
At the time, they also weren’t offering many financial incentives in order to lure the NC kids (I understand that they are more generous now). A couple of her classmates did go but they were interested in art-type majors. Both seemed happy there.