In the early 70's, when I was in graduate school, I ran the music instruction portion of a large local music store. Actually, I paid a commission for each guitar/bass /drum lesson delivered. I think we got $5.00 per lesson an the store got $2.00 of that.
Two buddies helped with the lessons. We had up to 75 students in the winter. That went to slightly under 50 in the summer.
Now, I give "no charge" lessons to 6 kids who are serious about jazz guitar. Some come from Cincinnati, Dayton and Knoxville. These are more like "sharing experiences" between people with a common love for the instrument and the art form.
Sessions are rather unstructured. We work on one thing, and I tell the person to contact me when he/she feels comfortable with that portion of the training, and we then schedule the next step. Over the years, several of these folks have progressed to the point whenre they blow my old butt away.
And that makes me proud!
Russ