A long time ago when I was just a newbie tutor, a parent sat in with my student for a lesson. After teaching the theory, I set the student to some work. For the greater part of the duration of the lesson, the parent saw me doing nothing but just watching the student do his work. Occasionally I would point out some things here and there but that's about it. The parents remarked that since I'm just baby sitting her kid and doing nothing much, how come I charge so much for the fees?
In the past, to prepare for the 2 hr lesson, I likely have to spend more than 2 hours preparing for it. I've already gone though all the different possibilities in the questions type, all the possible errors and thought through the best way to structure my lessons so that there is a framework for the ......