Its not that much. I have priced it up at about £1300 all in.
The question is, some people will have you believe you can clean the windows quicker with a pole. If this is true, and I stress the word if, it will pay for itself.
The problem I have is with my wife who says the average Mrs housewife won't go for it. She believes people pay to have their windows cleaned properly and a pole doesn't have the same impact in the customers eyes.