Startup Professionals Musings: MBA: Blessing or Not for an Entrepreneur?: "when an MBA really helps an entrepreneur:
If you are already an entrepreneur, more education, including an MBA, will only slow you down. Consider it a waste of time.
If you plan to become an entrepreneur, and already have business experience or an undergraduate Business degree, skip the time and cost of the MBA.
If you have a technical career with no business background, and you want to start your own business, an MBA can be a blessing by giving you the basic knowledge you need to manage your business."