If you're good at cleaning carpets, you don't get call backs...............never had one in 25 years, but you must qualify your expectation, with the client's expectation and ensure the gulf is not too big.
I have made a habit of TELLING THE CLIENT how well their carpets have come up and TELL THEM the marks have all gone, even " that one " you had doubts about!
If you give a FALSE or EXAGGERATED EXPECTATION and fail to get a decent result, how can you expect to get repeat business, which is what a service business is built on and how can you expect someone to pay you 4 or 5 times their own, or their partner's hourly rate.
If you LOOK THE PART and SOUND THE PART and do an excellent job and have proven yourself over at least a couple of years, you are justified in charging a higher rate than JOHNNY COME LATELY'S, including those with their little bits of paper