some people just de value there business there totally mad!!!if you owned a cafe would you be guarenteed the same income not at all but if you do good food at good prices advertise for deliverys ect ect you will maybe get more income.if you buy a haulage firm is the work guarenteed?? maybe untill the contract expires but if you dont continue to provide a good service at competive prices then you shgould do well.......................my point is window cleaning is no different work hard provide a good service a good prices be proffesional AND there is no reason you wont keep the work and expand.i would jump at buying good work for x1 x2 x3 x4 x5 but i would not sell my work for any of them, my business is all good work has a reputation(a good one) a good website ect ect ect and i would only sell for good money.And yes people can build there own if they want but any one can start any type of business up if the do the right research and are commited.