I believe he often compares it to the cost of water...
I'm not sure that his argument is that it should cost more than water, which i would disagree with, but that it should be at least at parity with water.

Really? You don't think that crude oil, which takes hundreds of millions of years to form, and fairly rare geological structures to preserve until today, made from millions of years' worth of sunlight, shouldn't cost more than something that falls freely from the sky?
--C