Because the B1G conference doesn't want nor do they promote parity. Other conferences have no problem with touting the competitive nature of their conference. B1G can't do that because they want those Top 3 to shine.
I've heard the Pac-12, ACC, and SEC announcers go on and on about how tough their conferences are and how teams from the middle/bottom can compete with teams at the top. Meanwhile, you have Meghan McKeown going on and on about how nobody can beat Ohio State, Iowa, or Indiana. Why not? Those aren't Final Four teams, IMO.