Think about it - subconsciously it easy to believe that people of the same type associate with each other - you know - "birds of a feather etc."?
In a way they are elevating your status from "just a window cleaner" to a proper tradesperson!
(Actually my mates
are a roofer, carpenter, builder and an electrician actually - along with a building society manager, a burger van owner and a couple of window cleaners too!)
So if you want a mortgage to pay for your new windows, roof and house re-wire I can get the job done - you want fries with that?