Glorieux, you are absolutely wrong about paid bashing.

Just to illustrate how costs in general are completely ignored, except by a few who are trying, lets look a one ton of Canadian Shield rock. Average earth's crust contains 28 wt% silicon, meaning 280 kg of silicon per 1 tonne of typical rock. I was into solar stocks last year and at that time 1 kg of solar grade silicon was worth up to 200 $. Lets use a value of 100 $/kg solar grade silicon, that means that a typical Canadian rock has a vlaue of 28,000 $ per tonne. So the question is: why don't we all mine, extract and refine silicon with all this worth? It could be something about costs?