I have taught people to cast, having taught myself aeons ago, even worked for John Norris for a few years, guiding, river craft, casting: but I stopped doing it mainly because I was not qualified. Nobody complained, maybe they were too nice!!
Every man to his own occupation, I say, mine was in electronics, not casting. If I had my time again, I would definitely pay to be taught properly. We pay to fish, we shouldn't mind paying to learn how to cast. At my age, my faults are too ingrained in me to be corrected.

TC