It seems that VCs are either following the herd or buying the vision. The latter is a safe risk to take because the timescales of some projects are 10+ years which means the VC can delay the inevitable (firm goes to zero) with a slim chance that the returns will be huge. Personally I have tried and failed to raise VC money, as a result I have some sour grapes when I see firms raise $20mn+ for moon shot ideas that make no sense to me. Having said that I would rather be beholden to my firm's customers, customers who pay for an unsubsidized product that meets a market need, today.