Some excerpts from an Athletic article: (paywall)
Delany believed changes in technology would cause live sports to only increase in value over time, so he bet on the possibility that the Big Ten’s best games would be worth even more. And then he made sure the league would be able to sell them again before the SEC, Pac-12 and Big 12 deals expired.
How much money are we talking about? In February, the SEC announced an annual revenue distribution of about $55 million per school. This year,
Iowa received $57 million from the Big Ten. Those figures include television revenue, bowl revenue, College Football Playoff revenue and NCAA men’s basketball tournament revenue, and both figures will only rise thanks to new TV deals.
In May, Florida football coach Billy Napier said SEC projections shown to schools suggest the payout per school will increase to somewhere between the high $60 millions and the low $70 millions when the league’s new $300 million-a-year deal with Disney for the games CBS was broadcasting kicks in. Big Ten revenue distributions will top those numbers once these new deals begin next year. The gap between the Big Ten and SEC won’t be as wide as it is between the SEC and whichever league winds up No. 3, but it should be larger than it was before.
For 2034, the SEC can put its entire rights package on the market.
That deal likely will reset the market, but that is a long time from now. How long? Because the Big Ten did seven-year deals with Fox, CBS and NBC, it will have sold its rights
again before the SEC gets another crack.