Myth : A Ph.D. means something.

Reality: The only thing a Ph.D. means is that you're not a moron, and you're willing to put up with the bullshit it takes to slog your way through a Ph.D. program somewhere. Empirically, having a Ph.D. is negatively correlated with business success. This is because the reward structure in academia is almost the exact opposite of what it is in business. In academia, what your peers think matters. In business, it's what your customers think that matters, and your customers are (almost certainly) not your peers.

[UPDATE: this is not to say that getting a Ph.D. is useless. You can learn a lot of useful stuff by getting a Ph.D. But it's the knowledge and experience that you gain by going through the process that is potentially valuable (for business endeavors), not the degree itself.]