This is 100% only about money. The Big12 won't expand because their TV partners have told them they would not be able to get equivalent value for their teams to keep their current per team value from decreasing.
Since they can't do that, in order to keep up with other conferences, they want to add other revenue streams:
1.) Champions Bowl
2.) Affiliate Scheduling
3.) Conference Championship Game
I think as has been stated previously, they should not be allowed to schedule games on championship weekend. That being said, championship weekend games will not be disallowed as the ability to schedule games on that weekend factored into their TV contracts.
This post was edited on 1/31 at 12:52 pm