Entrepreneurs are very positive people by nature. As a result we accentuate the positive. It comes from the same place as, "Come work for me - we're going to disrupt this industry! Please don't look at the legacy code in the corner." (And I mean this in a good way)

There's a large group of "grass is greener" people, but they're not starting companies or moving to Beijing to write about it. They work at the cable company in the middle of nowhere.