Car companies did reduce price when they became automated that's why they are cheaper now than the have ever been, in business its known as reducing price to sell more making bigger profits with more sales, many companies have to reduce prices to compete, fortunately for most of us in window cleaning at this moment in time that isn't the case.
Nathan I'm going to let you in on a secrete, most if not all shiners have a minimum price, its not because they need it to make a living its there to cover the costs and minimum work you have to do with every job.
For instance yours is a tenner, another guy who doesn't need a web site, hot water, nuclear resin, Vision, PPB filtering, customer texting, monthly paid software to keep track of a few hundred customers, every new gadget that enters the market and so on may only need a £7 minimum charge and could still have more in the hip pocket at the end of the year.