I teach small children and am working up to a teen and adults class. I want to be a good example and am now seeking to repair some injuries I've had for a few years. I ignored them because I chose to take care of some pressing family matters and a couple of family members who needed me very badly.
Just teaching the children incites me to go over material every day - if not physically, then in my head.
But I don't make ANY money off my classes either.
As a parent I know most people get their children into sports to keep them occupied, but also to foster the personal qualities being part of a team sport or a long-term sports commitment affords the developing child. Teamwork, individual excellence, sportsmanship, comraderie, belonging, responsibility, etcetera.
Most parents bring their kids to martial arts specifically to learn discipline and respect, focus and to learn to defend themselves against a bully. These and so many other things can be found in TMA just by the nature of the training and I'd much rather have a hand in someone finding these qualities in themselves than turn out a ton of black belts.
As the children progress, I learn. One important thing I get from teaching these kids is the reminder that I don't know everything there is to know - not only about the art, but about anything, period.
I don't think I'll be able to make a grand living off of this, but what happens happens.
As to a part-timer training martial arts and whether they are a real martial artist or not ... I won't judge myself because I can only say I aspire to embody some of the qualities of a martial artist. People come to MA for so many different reasons, I must say that while constant attention to your dedication is necessary, I will not condemn those who don't make a living at martial arts because we walk around and see scenarios, possibilities, create and recreate a plan and a backup plan, etcetera even when we go to the grocery store. During the past few years as I've not been able to train much physically, I have been going through forms and material in my head every single day. It's what I would expect of anyone injured or ill who wants to keep going. It's what a black belt in our group did during his cancer and another during hers, I'm sure. It's what we all do.
Your martial arts garden is what you make it, how you grow it, how you feed it. Others can judge or pride-call or whatever they need to do to grow their garden ... but you don't have to swallow their zucchini.