There is an office cleaning company near me that has a large staff, they all get low wage, about 6 pound an hour, but the offices, and there are plenty get a very low fee. I sent one of my customers their way and the price was so cheap that they thought the monthly price was a weekly price.
Point is that if you charge low, most of the time you can get the work even if your staff do a rubbish job. Looks like the same thing might be happening with window cleaning. By the way the guy at the top is well loaded.
Simon.