Rail, you well know it's all about "gate", as unlike many West Coasters that draw average or play in mid-sized venues, that SEC and southern football powers draw 80K+, and need the home game concessions to fund their athletic programs..they need 7+ home games minimum.
Trust me, Fla, Tenn, UGa, LSU, Bama, Auburn, FSU, Mia, VT, and The Big-10 powers, would all love to play a Pac-10/Add ND game for a trip the BCS title game, not that USC hasn't been the king of late on it's own decided merit.
Washington, UCLA, ASU, and Az's slide of recent, coupled to Oregon's slight regression from elite form, has made USC's recruiting from a Cali/West Coast/Mountain West/National platform a bit of shooting fish in a barrel.
In contrast, Deep South schools divide their talent pools.