[Cardinalfootballguy]

Its all about the green.. The only reason he won the belt was because of edge having to retire and Vince smelled a lot of money if Christan won the belt and having edge come out to congratulate him, on which he did, The reason orton was moved over to SD was to be the big time money replacement for edge. Don't get me wrong I would have liked to seen Christan keep the belt for awhile, But he is not a top card guy that can bring the money in unlike Randy. Randy is the center of SD and it will revolve around him and him being the top dog on the show.
I think this actually says it best

"Additionally, we were told that Christian's title win at Extreme Rules was done not so much as a "well deserved win for Christian," but much more so that a big moment could be made for Edge at the PPV. "Vince [McMahon] could smell, touch and taste a moment between Edge and Christian celebrating on PPV, and that's the major reason why Christian was awarded the title." This dispels any conspiracy theories that Christian was awarded the title to keep it on Smackdown, as we were told it would have been very easy for WWE to throw a third party into the Extreme Rules match which would have kept the title off Christian and still on Smackdown."