How would it be unfair? For the entirety of the 4 team playoff the money was split equally among the P5 conferences. So for over a decade that formula was acceptable, even though the SEC and Big10 put more teams in the playoff.
So if in 5 years when Ohio State, Michigan, Penn State, Oregon, etc demand a bigger CFP payout split vs. the other Big10 schools that don't put teams in the 12 team CFP, that will be fair? I doubt Iowa, Purdue, MD, Rutgers, UCLA fans will feel that's fair!
What's after that? OSU, Michigan, Penn State, etc. demand a bigger share of the Big10 Media rights deal because their game TV ratings are double or triple the Hawks, Boilermakers, etc. After-all FOX, NBC and CBS are bidding $1B annually to show the Buckeyes and Wolverines vs. the Hawks. So I guess that's fair?
Sure the CFP power play by the Big12/SEC is better for those 2 conferences. It tilts the playing field toward those 2 conferences. But do you really think the Big10/SEC greed is better for College Football as a product? Do you think it will grow interest, attendance and viewership over the next decade?