Therapists are not, in private practice, paid a salary. They are paid on a services provided basis. This time the therapist did not provide the service. It is like ordering lunch - I don't pay if the lunch is not ready or not correct or not on time.

I bill on an hourly basis. I don't get to bill at all if I don't do any work. I don't get to bill for an hour if I only do 30 minutes of work.