I have observed in various walks of life that whoever is in "it" for the money ends up being, at best, moderately useful for their organization, moderately effective at growing, moderately effective at learning and ultimately moderately effective at being successful. And that's one of the more optimistic scenarios. As an ironic consequence, they also end up being only moderately successful at getting rich, that is if they even have the mental chops necessary and a healthy dose of luck.

This is like Orwell's double-think: You need to care every once in a blue moon about your well being (compensation, benefits, etc.) and then immediately forget about it and do whatever it is that you're doing for the joy of it. I have found people's sustained focus on their own well-being to be one of the best predictors of their (lack of) contribution to wherever they are in life.