I think a friend of mine in the business told me a while back that a 1MW turbine was about $1M (if someone could verify this, that would be helpful). That's just the turbine. He also said that one of the biggest problems in getting a wind farm up and running was the procurement of those turbines, which are in short supply due to the uncertain financial future of wind power. Nobody wants to invest in the manufacturing infrastructure only to have the government yank the profitability of the industry by canceling the tax incentives. Keep in mind that people are building farms on the order of 300MW - way, way smaller than the millions mentioned in the article.

You also need the right kind of wind patterns. It's not as easy as buying 1/4 of Alaska. You need to look at the wind speed distributions over time and pick a certain set of conditions to make it work.