You know, bl, the Big East as originally created was really meant to be "just" a basketball conference. That was the basic plan. It didn't expand to encompass other sports until later. The league was created in 1979, but women's basketball didn't compete until 1982, Big East baseball came into existence in 1985, soccer around the same time. Around that point the NCAA began encouraging teams to compete in conferences for all sports and simultaneoulsy, encouraging the elimination of single sport conferences. So when UConn for example, joined the Big East it really did do so as a basketball league. Rutgers and Pitt not quite so much, but at that point, again the NCAA was trying to encourage leagues, BC, Syracuse were looking for football partners. What made sense in 1980 or 1991, though might not make as much or any sense in 2012. Indeed, I think one could argue pretty strongly that it does not, given that BC, Syracuse,Pitt, Miami, West virginia and Virginia Tech, all members of the original big East football conference, have left for different conferences. UConn, Rutgers and probably most of the others would do the same thing if they could.
Not sure why you're grouping Rutgers and Pitt. Pitt joined in 82, when it was still basketball, only.