Why should we charge less than £10.00 per house ?
Quite simple really, you charge what you are happy to clean a job for, and also sometimes depending on areas, and amount of other window cleaners in those areas, things like this can dictate what can be charged.
I however agree we should value ourselves as to how good of a job we believe we do, but my point is you can earn more charging £8.00 for a job rather than charging more, as the smaller jobs may total money over the course of the day, giving you a better hourly rate when it is divided by the amount of hours worked