Think an MBA is what you need to achieve your career goals and start making the big bucks? Well, think again. In reality, that time going back to school can set you back both financially and experience-wise, and can completely derail your long-term path towards greatness. But don’t take our word for it. Elon Musk, CEO of Tesla and SpaceX and the man who is currently sitting as the second richest person in the world can concur.