@CoalTrain isn't as far off as people think.
I have relatives and visit often North Carolina (ACC Country). There are a lot of people who watch SEC Football and ACC Basketball. ACC Football just doesn't have the fan support with the exception of Clemson, FSU, and maybe Virginia Tech.
B1G when it comes to fan support, is on par with SEC but the struggles of all the programs not named Ohio State is wearing on the fanbases there. The B1G does have some dead weights though: Rutgers, Indiana, Illinois, Minnesota, Purdue (although I have met a lot of Purdue fans).
With the exception of Oregon, Utah, and USC, I have never really met very many fans of teams in the Pac12. Like the Northeastern USA, the West Coast just doesn't seem that interested in College Sports.