SamA is not an MBA. He did CS for 2 years and dropped out to build a startup. He's YC personified, and the person most responsible for the phenomenon you're talking about. Take that for what you will.
So dropping out of CS to start selling something was more important to him than 2 more years of CS education. Maybe he realized that continuing his engineering education was unnecessary because he preferred selling things. Sounds like a salesman.
