Why not pick those best suited for the positions in the cabinet? Well according to The President, they are. They are the ones with the ideas that will help him achieve his goals.
Another peak into Obama's mindset is that in his book "Dreams From My Father," he wrote about his short time in the pricate sector as time spent "behind enemy lines."
He went to Harvard Law school so we know he's no dummy, he knows what the Laffer Curve is. The only logical conslusion is that he is trying to strategically dismantle the US economy so that he can fundamentaly change the United States.