I have one of their fridge magnets too Peter, has a picture of a duck, and their invoice, says "your now a customer just quote your postcode" they wont be though, used us day after the clean as they wasn't happy with their work.
Plus a few that moved their furniture for them not to turn up. Not good for reputation.
Long term you need repeats, its harder than most think to get repeats nothing less than a first class job gets repeats, and it's the repeats that keep you going through a recession.