Big 12 and ACC can't pay what the BIG pays. So the Big Ten's response would be, "Want $10 million more per year or not?"
https://www.usatoday.com/story/sports/ncaaf/2018/03/14/big-12-reports-371-million-revenues-2017-up-more-than-18-percent/426331002/
That said, since recent conference realignment makes absolutely no sense, I look forward to Rutgers joining the PAC 12 next year.