Slive has been open about it. They plan on starting an SEC network, and to do that you have to have **** to put on TV. Because most of their quality inventory is already owned by somebody, they have to add teams to build the inventory.
If you are starting a cable network you look at markets. Like KC and SL over Morgantown WV. Because they will be purchased on a per subscriber basis when the exclusive cable network is built.
But what incentive do the contract holders for SEC inventory have for offering more on a per team basis? As it is, they are not gaining any additional inventory for themselves, just different choices from it. Current rights holders care less about markets than they do about ratings. I think that for them, an MU game against Mississippi State has less commercial appeal than MU/KU. aTm versus Vanderbilt isn't going to ring the cash register the way aTm/Bevo did.
I expect the contract look-in from adding aTm and the Tigers amounts to little more than bringing up the per team distribution so that it equals what all teams were receiving when the league had 12 teams. If they didn't have assurance of that, most of the teams would have been voting to reduce their TV payout. But the real money to be made is getting a conference network showing football games on Saturdays. That's the gamble they are taking. The Big 10 network changed everything.
SEC network could be exactly what it takes to push Florida State and a partner to the Big 12 and make the Big 12 it's equal or better in any way.
An ACC network would never have the football clout of a Big 12 network with the current ten, let alone if we throw a major Florida program in the mix.
They don't even have to worry about triggering destruction of a conference since the ACC and Big East both have a bazillion teams now.