Don't forget Michigan (Zinter the elder). Someone told me Preston Zinter went to BB&N for a couple years as well, though I'm not sure and he's at Lawrence Central Catholic now.
But, yeah, the majority of kids in Hanafin's class will go to an Ivy or equivalent for college. Very few will go to state schools in the South.
That said, Clemson seems to recruit (regular kids) surprisingly well from the Boston area. I see a lot of Clemson window decals on cars around here. I do think some kids want something different. Throw in the WR depth charts, our lack of a QB and his apparent relationship with Vizzina, and the sense that Ronan's buying what Dabo's selling, and here we are.