Disagree. As Jarek said, the siliconmilkroundabout event yesterday says the opposite. I attended yesterday and I was actually surprised by the energy and passion people have for their own products. Its really changed my perspective on start ups.

My biggest concern with start ups is the work/life balance. Putting in unnecessary hours and producing mediocre results doesn't sound so productive to me. I understand the occasional long night once in a blue moon but if it becomes a weekly or daily thing then you are immediately fall into sleep debt.