[Hokusai]

> can help you get a lot done

That is survivor bias. I have worked with such people and they destroy companies and make employee life miserable. It is impossible to get anything done in the company that does not help the megalomaniac ego. And they usually sabotage efforts that benefit the company but not themselves. It looks cool in movies and from far away, up close it is a train wreck.

[mcv]

Isn't that narcissism? That's all about ego. I thought megalomania was more about results.

[Hokusai]

My understanding fits with the dictionary definition.

megalomania /ˌmɛɡ(ə)lə(ʊ)ˈmeɪnɪə/ noun: megalomania. obsession with the exercise of power. delusion about one's own power or importance (typically as a symptom of manic or paranoid disorder)

[wolverine876]

> Isn't that narcissism?

Excellent point in itself - I should have used that word, maybe in addition to megalomania, in the comment that started this subthread.