My instructor taught for free at his house in his dojo. To be brutally honest because it was free I didn't value it at first as I should have. It was later on that I saw what we truly had.
Later on I had to get over some hang ups I had about teaching for money. But even though my instructor didn't charge later on I started to.
1) If you are accepting money, it is more a business transaction than a personal one, so even if I don't feel up to teaching a class, or it is inconvienent for me to make it to the class etc. etc. I'm going to make it because money has changed hands, I have a responsibility to show up, be prepared, and teach.
2) People vaule your instruction more. It's true. Money is like rank, if you charge people vaule it because they have an investment in it. Why I equate it to being like rank is that I use to teach TKD and Arnis, now I was ranked in TKD (BB) and I was preparing for my Lakan (BB) test in Arnis. I had other BBs who wouldn't work out with me in Arnis but after I tested now I was OK. Same thing with money, when I charged less student's didn't take it seriously, I charge more then I had students who did take it seriously.
3) You have cost associated with teaching. You pay for your lessons, therefore have your students help pay for your training. Both of you are getting benifit. You have travel costs, gas, wear and tear on your vehicle. You have expenses if you are providing equipment, or the place to train, insurance etc. etc. If you transform a garage into a dojo or training area you are giving up a portion of where you can park your car etc. etc. plus making the place safe to train.
While this can be seen as minor stuff now, my instructors garage was converted to his dojo about 25 years ago. He has remolded it a couple of times, new walls, matts etc. etc. I converted my garage about 8 years ago. For my instructor that was 25 years of not being able to use the garage except as a dojo. My garage hasn't had a car in it for the last 8 years.
I'm very loose with people paying me, I've gone months with students not paying but when they get the funds they pay. It is respect.
Mark