We clean carpets, that is the main objective, yet there is also "the show."
There are things that build value to the customer. Booties imply professionalism. Walking through and cleaning up stray water, grooming the carpets or leaving a "free" bottle of spotter all build value in the mind of the customer.
Go to a Japanese steakhouse where they cook in front of you. You have had better food where there was no "show," and you have certainly paid less for that steak or shrimp at a place where you don't get a show, but they have no problems getting repeat customers.