It has been said that repetition is the mother of all learning.
An appointment once a year, once a week, every day, it doesn't matter as much to them, as it does to you. Your time is booked and payment is expected. Most places have a fee for cancellations or no-shows. Many places schedule the same person with a standing appointment, over and over, and still time is wasted when that person fails to arrive.
We believe in quality of care and the need to ensure payment.