"Just pre-buy a ticket you might never get to use. I don't think he wants to sell real shares that would give stockholders a say in his management. He is running SpaceX for himself and his glamorous friends."
You have SpaceX confused with the space tourism companies like Virgin Galactic and Space Exploration. SpaceX is not in that business.
http://www.pcmag.com/article2/0,2817,2414133,00.asp
Oh, yes he is. Branson and Diament (sp?) and all of them are driven by the same desires and the same end is to be The Guy who gets them into space. Even miserable LEO for five minutes. Even the Amazon boys are part of it. They could get what they want by combining their billions, but too many egos spoil the rocket fuel, so they need political pull.