When speaking at Y Combinator's Startup School, Mark Zuckerberg made it clear that some people can do a great service for the world, even if their only motive is to "be an entrepreneur".

Zuckerberg said that he created Facebook because he felt like it needed to exist, but that he had immense respect for Jeff Bezos, even though Bezos' motivation for being in business was of a different nature than his own.