I don't think it would mean less money. Adding OU and OSU to the SEC with Texas A&M, LSU, and Arkansas would really solidify the SEC's position in Texas even without bringing in University of Texas as all of the schools have large number of alumni in Texas. And, it would add more marquis matches to the SEC, which, down the road with cable unbundling, will become even more important for conference financials.
Personally, I don't think OU and OSU are going to the SEC, but crazier things have happened in conference realignment.