Well Im not one to put down peoples ideas and hard work on here as I have been on the wrong end of that many times so forgive me for saying.
I hope this idea never comes to my area, I really see that killing the best thing in the job! regular repeat work! I dont think this is going to do window cleaners any favours at all. I have not experienced the problems you are talking about and my business grows and grows month by month.
My plan, shows the customer a price, gives them a choice of frequency, currently 6 and 12 but will be 4,6,8,12 soon. then they are availiable to purchase by the window cleaner at a rate that is currently 1-1.5x a clean value. Additional services like gutter clearing ect are being sold for just £5! putting the cleaner well in the money on the first clean. Then they are a regular customer for that company and there is no member fee. The only cost is if they decide to buy a customer. My campaign starts tomorrow, I have no idea what to expect but I can say that 200,000 listenters will hear my add on heart fm next week. If sucessfull I plan to scale the business up to a national level within 18 months and become the place for the public to find top window cleaners and the place for window cleaners to grow their REGULAR businesses.
Im really very sorry to put your plan down especially after what must have been alot of hard work but I simply cannot wish something luck that threatens the best aspect of our businesses. My plan makes everyone a winner, not just the customer and the owner of the website.