Honestly, I was always sort of surprised that the Big East did not give them a longer look.
Like you said about the SEC, it would have planted the BE flag squarely in the heart of ACC country, and, put the BE TV network on the air here. They would've been competitive in football, and, been one of the very best baseball programs in the league. Basketball would have suffered, but, they would've been competitive in time.
And, it would've been a MAJOR irritant to the NC ACC schools, knowing that a BE league member was right in their backyard.