Weird, Mizzou apparently published a report that said they'd make 12 million more in the SEC than the Big 12.
This figure was assuming the SEC renegotiate there tv contracts immediately.
Even then, if using the same duration of contract (15 years), and adding two teams, you'd have to increase the payout by approximately $150 million a year between Tier 1 and Tier 2.
To put how hard that is into perspective, it would take increasing their CBS Tier 1 deal from $825 million to $1.2 billion (over the fifteen year life of the contract), and their Tier 2 deal from $2.25 billion to $4.1 billion over that same time span.
My guess is that the addition of Texas A&M and Missouri wouldn't be worth an additional $2.225 billion over the life of the contract, but obviously, I've been devaluing the potential revenue generation of Texas A&M and Missouri over the years (since they haven't rained down that kind of cash on us).