Ilya Lichtenstein on the Fear of Money:

Their fear is justified, because the second you start charging for a product, all of the bubbly bullshit falls away. The market is cold, rational, and effective. It doesn’t care about your lean startup methods, your rockstar team, or your fawning tech press. All of your assumptions, vision, business plans and pitches are irrelevant.

You’ve either built something worth paying money for, or you haven’t.