It looks like I view things similarly to a lot of people on here.
If someone approached me for a quote just to try and get it done more cheaply I'm not so keen on that as we could all end up working for peanuts. However, if it's because of poor workmanship, unreliability, then no problem. The bit about not being able to do all the windows seemed a greyer area to me though. I'm taking the view that I have invested in my business partly to allow me to reach all of the windows and to work more safely and faster etc. I can't really be faulted because not everyone has done that yet. The bit that I find odd is that long before I had even heard of WFP, I often made an attempt at difficult windows with an Unger pole with an applicator and squeegee on the end. I'm surprised that more trad window cleaners don't do this. I even got swiv-loc applicator and squeegee too in case there were difficult angles. I couldn't get to everything but managed to reach most.
Due to this, I even started using the swiv-loc applicator as my applicator of choice. This was due to excessive wrist ache. With the swiv-loc, the bending takes place on the applicator neck rather than my wrist. Obviously that is less important now as I don't use an applicator much due to using WFP.