Why do you charge additional fees for certain services?

By charging fees for services, such as office visits, e-mail visits and phone consultations, I am able to keep the annual access fee lower, so those who do not require those services do not have to pay for those who might need them more frequently. Most current practices charging an access fee cost at least double my current rate. Some of these practices include all care in the annual fee. I believe in you paying for what you need as an individual and not subsidizing the care of others.