Logisitics have a lot to do with this. There is no Academy in the GSP-A area. But there is CESA. Kids have a choice...stay home and play for CESA or drive 1-2 hours each way, 3-4 times per week to play Academy.
I'm a big Academy fan.....but if we lived in the Upstate my kids would be at CESA.
I do think SCU gets 90-95% of the "1 percenters" in the Coastal area and the Columbia area. You aren't going to get a "State" team without people driving huge distances.
There are many older academy eligible kids who drive from Columbia and Charleston 4+ hours to play at CESA, if the Acadmey is all that why dont they just play there? My guess is that it isn't all that because it isnt a true "academy". If it was it would attract ALL of the best players and all of the best coaches.