Unless I misunderstand your use of 'confidence', that's exactly wrong. Confidence is necessary for anyone who wishes to achieve anything extraordinary. It'll

Unless I misunderstand your use of 'confidence', that's exactly wrong. Confidence is necessary for anyone who wishes to achieve anything extraordinary. It'll come in handy when you're working on a dinky little idea that no one else understands or respects. It'll come in handy when you're quitting your day job, driving a crummier car than your neighbors, and working late into the evening for $0/hr. It'll come in handy when you're asking investors for money. Need I go on? If you make important decisions solely on a rational level, how in the name of all that is holy could you ever start a company? What if your rational decisions never lead you to a 'positive expected return'?