The SEC has twice as many viewers than the Big 12. 4.5 million vs. the Big 12's 2.3 mil. And the difference is only going to grow as A&M/Mizzou are replaced by smaller schools.

It is criminal that the PAC12 has bigger TV deal than the SEC. They only have 2.1 million average viewers, less than half of the SEC.

The Big 12's TV deal is about $20 million per, and that doesn't include 3rd tier rights.

The SEC "should" get around $40 million per team with escalators, plus a nice pile for 3rd tier on the SEC channel.


Source
http://www.teamspeedkills.com/2012/2/28/2831170/sec-wins-football-ratings-national-title