Yes, you got it right. A lot depends on the point, geographically. If the turbines are located near the sea, you have almost constant wind gust, of course there are days when they don't work due to no or low wind, but it also depends on what kind of turbine you have, some models work even with minimal wind, own mechanisms of drive. I know a wind turbine owner and he told me that for the past year one of his 3.2MW wind turbines made 350k euros, keep in mind that this is a turbine with a good location. Some people buy used turbines/second hand, it comes out cheaper, it's all about luck there, if you come across a good turbine you get a quick return on your money, and everything above is a good profit.
I'm not a big fan of "green" energy because realistically no developing economy can grow with that type of limited energy source.