In my experience, some narcissism is a requirement to be a startup CEO. And I don't mean that in a smart-ass way. The incessant representation of the company seems to require a strong identification of one's self with the company. It's sort of an enabling trait which has some potential negatives consequences. Among the latter would the perspective that sees everyone around them in the company as an extension of their will. Getting to the point of being a "real" CEO also usually requires some more-than-usual self-involvement and identification of one's endeavor with one's self. Good CEOs (by my standards) just have a touch of this. Many have too much. As you indicate, there's a certain logic to it.