In addition to reporting on the number of appointments, number of bookings, and number of hours, you can also report on the value of your appointments.
Value is determined based on the prices set for each service under Setup > Services. So an appointment for a service that has a price of $50 will have a value of $50 for reporting purposes. If an appointment has multiple services, the total price of all services will be added up and included in the value.
The value reported is not affected by what is actually collected from clients.