Yes I just looked back at the original question.
I have answered something similar in another post. He is complaining about the increasing price of amtec motors.
The real truth is that any reasonable quality servomotor is a precision and expensive piece of kit.It would not be the sort of thing that you would go out to buy for a wind generator. Because they are old devices and their original purpose has faded they are now effectively scrap and have nothing other than scrap value. Those fortunate enough to catch on to this early enough snapped them up for scrap price. It doesn't seem surprising that with the popularity of ebay, people have found that fools are prepared to pay serious money for a scrap item, just the way of life.
There is an increasing number of people seeking a free ride or so they think and they just need spoon feeding to make this a reality for them.
In reality the little amtecs and similar make nice little wind generators for small remote installations requiring the convenience of a little electrical power but not really needing a great lot. They may also be a good starting point for newcomers to get their feet wet and learn about building blades and constructing things. If you are willing to scrounge parts including batteries then it may even save you a few pence even if you are on the grid.
Unless you scrounge everything then there is no saving and it will never cover the cost of batteries so there is no hope if your servomotor comes at true cost.
If you are grid connected then to save money you need serious investment in larger turbines, batteries will not be justifiable unless you get frequent power cuts, grid tie inverters are costly and you need a reasonable size installation in a good wind area to get payback in a reasonable time. If you have to buy the turbine at full cost from a manufacturer then anything under 30ft may never pay for itself. With self build this may bring it into the realms of 10 to 12ft.
For those who can make good use of heating then again things above 10ft may pay off.
By all means have fun that is mainly the point of this. If you are on grid and want to keep it small then don't expect to save anything unless you are shrewd enough to find good bargains. Don't blame the entrepreneurs that make a few bucks from your desire for a free ride.
Flux