Those CC games will be ranked and already projected to make the CFP. If you win you get a bye game. If you lose you probably get home field advantage first round game. It’s an extra game on the schedule, with a likelihood to get key players injured. I’m not sure the risk is worth the reward.
I wonder if teams will throw games. They agree to whomever is winning at half wins the game and both teams will coast in the second half and put in subs.