I am not addressing demographics, which I think is what you are getting at, but I do have a side point.
It's my belief (not knowledge) that the value of games to the networks goes up EXPONENTIALLY with viewership. Low end games are almost valueless, because they can get de minimus viewers for free, just showing rerun cop shows for nearly nothing.
So breaking that down with some guesswork:
The SEC has 56 conference games. And if they are getting roughly $700M for them (no CFP money in this), that's $12.5M per game.
What if the 10 highest viewer games drive 80% of the value? e.g. 10 games are worth $55M each, and the other 46 games are only worth $3M each? And even of those, it probably splits that 10 games with 2-3M viewers are worth $10M each, and the other 36 games with <1M viewers are worth $1M each.
It would explain why an expanded CFP with 11 games would be worth $1B as we see in the reports and estimates. They'd all be the highest rated games of the year.