Rick... You still forget about TIME. It takes more TIME to set up wind farms. I don't care if it's 1/3rd the price of solar power. The time spent is time lost looking for more resources.
And if solar farms took up 100 times more space (each panel needing 10x10 tiles of space) then people would be spending A LOT more time building them. And the space they would take up would be 25 times larger. To make a farm that would produce 100 EU/t would mean you would consume 200x200 tiles of space instead of just 10x10 tiles.
Yeah, if a solar panel cost 9 diamond i would think they are quite expensive and building 100 of them (that's 100 diamond blocks dammit) would be pretty much impossible considering how many diamonds you would have to find.
Once more you are just being irrelevant and making everything you say up on the spot... And believing it.
EDIT: Oh, and i hate ALL free generators mind you. I just hate solars the most.