WFP isn't a waste of money. I've never heard of anyone transferring to WFP, then going back to ladders.
However, there is a local WFP guy who lives near me who has had some 'doubts' about it; but he seems to have got the knack and embraced the technology.
I find I'm taking on jobs that I would've refused pre-WFP. This morning I cleaned a large farmhouse, with veluxes and dormers in the attic and a large Georgian windowed conservatory (including roof; every month).
That job would've been rotten to do traditional; extremely hard work and quite a few awkward windows would've had to have been missed.
But it's a breeze with a WFP and it pays an excellent hourly rate.