I'm with you, but again though, they can do that at 16 and share it with less mouths. There is quite literally no one out there that matches Texas, Oklahoma, Alabama, Georgia, Florida, LSU, Tennessee or hell even Auburn. The strength is there without need of dilution.
With 32 teams you could toss out CCGs and pit the top 4 against each other in an 8 and keep all the money. 20-24 does nothing more than give you what you have, except instead of paying them in the ACC, you're paying them in the SEC. But, at the end of the day, there aren't more slots available to watch the high paying games during the season and the B1G/SEC already own the best ones. If you add 16 more teams, that's 4 more games a week that need to be shown to pay for them.
The most valuable in is likely keeping the B12/ACC at 16 and let them fight for the left over slots while you get paid a premium for the best ones. Then give them some post season money by performance, which you know you'll earn the lion's share of. That way you give away a little to get a lot, as opposed to needing to support these moves all year long.