Supposed spoiler talk:
If they recognize that Cena's match is not the one they should end the night with in front of a Philly crowd, why would you end the night with Orton winning MITB over RVD, Punk or Bryan?
Well the odds basically says two people have the best chance of winning. One makes sense and one makes none but at least the main event for Summerslam is the same no matter who wins money in the bank.