The primary difference is that I do not double-book myself. When you arrive for your appointment, you are the only person I am seeing at that time.
Also, depending on what we are doing, I could be working face-to-face with you and your condition for the full 60 minutes. The time is all yours.
My model does mean that I am often not the cheapest option on the market. But I make sure that I give my all each time we meet.