I don't care if the B12 has told you no in the past. TCU was persistent. I bet WVU was persistent.
Maybe this IS their #1 priority. However, if it's not . . . it should be. BYU should be doing everything it can to show that everyone wins if BYU joins . . . even if that means throwing money at them.
No other success can compensate for failure to be in the P5.