This, obviously, is a matter of value judgment.
Narcissism is a powerful force, akin to the psychological element in drug addiction.
The Narcissist is sustained by ever increasing amounts of Narcissistic supply. Adoration, approval and the maintenance of an audience of fans - are the nourishment without which the Narcissist shrivels. Depending on how talented the Narcissist is, Narcissistic supply could be the by-product of real achievements. A Narcissist will, usually, apply his skills and exploit his natural advantages where they would provide him with the highest Narcissistic rewards. He will write books to gain public acclaim - not because he has something to say or because he cannot contain his emotions or his message, for instance.