Well, The thing is that although I do not put the prices up I suddenly am able to do more work on a lot of houses I used to do. So for instance that window above the conservatory is part of the deal now, which of course the customer is happy about, and so am I because it means that I have another window to do.
So some customers prices do go up, I suppose in special circumstances they could go down as well. The only case I can think of where a price would really be justified in falling is a local church near me, it has lots of windows which are only about 10" high. The problem is that they are all about 10 foot off the ground. All local window cleaners factor in that they are going to be going up and down the ladder all day, doing tiny windows each time. Those that do not factor it in make a big mistake and never do it again, every window cleaner that does it comments on how tired they are after going up and down 5 ft all day none stop (insides as well). So as you can imagine they are some of the most expensive "per foot" windows in the area. Normally with trad method you lose a bit on upstairs widows and make up for it in downstairs windows, but with this job it is nearly all ladder see?
There is not "much" speed difference between downstairs trad and WFP, its the ladder jobs where the real speed factor kicks in. I dare say some WFP guys might consider re pricing this job and forget that it is normally all ladder, they may even under price it not realising how tiered they will be after doing the insides.
The chap who does them at the moment wants a back pack, I know he won't drop his price and so he should not too, after all he is buying a back pack to do less work not more, the purchase itself will come out of his takings so in effect he will already be taking a price cut. He is also a very nice chap, so he has no fear of me ever pricing the job up.
So in some cases the price goes up, in very very rare cases the price would drop (eventually, due to competition, though most WFP guys would never drop a price without being forced to).