The 10 Mountain West schools other than Hawaii and Boise State made $1.1 million per year per school under the current deals with CBSSN and ESPN. They could hit $3 million or more under these new deals.
“We believe that we have a good faith obligation to offer to enter into an exclusive negotiation period with CBS, but do not believe that CBS has any first refusal rights for reasons that can best be addressed by our legal counsel.”
This deal likely wouldn't have worked for both sides without ESPN+. Gaining Big 12 streaming content for that service allowed ESPN to pay more for these championship games than they would have otherwise.