[robnado]

You're talking in the order of hundreds of thousands of those things to replace the current electricity production of the world. A conservative number for their cost is in the order of 10 million dollars per unit. Therefore, around 1 trillion dollars to replace all the worlds electricity. Multiply by 10 just to be safe and consider cost of land, cost of maintenance and operation and the fact that those things don't work at peak capacity all the time: so around 10 trillion dollars. That's about the amount of money the world pays for petrol in 3 years. Let's also consider that the cost of those things will go down as we build more and become more efficient at building them.

The world has everything to gain by building as many of those as current wind patterns permit.