What could he do with the resources and force of the US Government at his back instead of just a little cash?
He would do the right thing for the very reasons you condemn him. His ego would not permit him to let down the American people. I have absolutely no problem with a man with an ego - as long as he has the accomplishments to back it up. Trump will surprise you. Cruz will lie to you.
His ego will not permit him to lose.
He is his own special interest, so if it is his idea or he wants it, he will get it or take it. That means the rules just won't apply if he can get away with it.
Now, put the full force and power of the United States' Government behind an ego like that.
What could possibly go wrong?