I might be wrong...but I believe the 'one of the following' that BE uses is not which county but an overall area...basically the Charleston Tri-County Area is the area which BE draws from.
Don't be confused, though, because as it was said earlier the vast majority of BE athletes(especially soccer) comes from Mt. Pleasant, which basically envelopes Daniel Island. The rest come from surrounding areas, no further than a 20 minute drive away.
SO...while it's possible for BE to draw from a very large area, it's hardly the case and therefore needs not be addressed.
As for BE's classification, I don't doubt that soccer could compete in both 3A and 4A, and win championships every now and then, but it's not our choice; if soccer were to be moved up, all sports would be moved up.
Instead of challenging the school's choice to be play in SCHSL, how about looking at the system itself: Why shouldn't individual sports be granted exception to move up in classification? Personally I would've loved to play in 3A or 4A when I was there. We already play the best there is throughout the season, why not allow us to compete with the best for a championship?
