"The thing that drives me crazy is when comics say 'I have low self-esteem.' No you don't. You're standing on stage asking people to pay. You don't play an instrument. You want people to pay to hear what's in your mind. You don't have low self-esteem. You might have other problems."

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Customers don't know what they want. There's plenty of good psychology research that shows that people are not able to accurately predict how they would behave in the future. So asking them, 'Would you buy my product if it had these three features?' or 'How would you react if we changed our product this way?' is a waste of time. They don't know.

— Eric Ries