I don't know why I like them. 35-40 years ago I saw the Boeing Mod 2 blade windmill in a brief article in Popular Science and I've liked them ever since.
I've read that energy payback is about 8 months.
If that's so, why are wind farms usually abandoned when their subsidy expires?
The fact is that wind power is economically feasible only in certain specific circumstances -- such as a residence located off the grid. It is incapable of being a major contributor to the grid.
You would appear to be reading only windmill manufacturer marketing brochures.