Martial arts students are kindof reliant upon the teacher, are they not? They are trusting the teacher to teach them something useful, to grade their progress, to provide a safe environment for learning and all of that.
If they decide to become teachers in their own right, then they have to usually provide references for their learning for people to take them seriously.
So all of this puts a lot of opportunities for manipulating the situation into the teacher's hands, and when $ becomes a factor, a lot of teachers can't seem to help but manipulate the situation into what's best for them, which is more $ at the expense of the student, the training, the entire situation.
In other words, there's a lot of opportunities for cheating and blackmail, of a sort.
Whenever teachers start charging and have a business, it seems usually like it's only a matter of time until all this nonsense goes on. Very few teachers I've met don't abuse the situation somehow by getting lazy, or greedy, or whatever.
In fact, they offer books and courses in how to do this -- essentially a lot of the things I put are offered in those courses as how to milk the students for more $$$.
So, yes, I have something against this. It doesn't seem right to use people in this manner, does it?
Personally, I don't think martial arts should be taught at all for profit. Because whenever people start charging beyond their expenses for the room and gear, it seems to start causing problems.
I mean, it's the same thing with other professions, like car mechanics. That's why they have government licensing and certification for many professions, and the BBB, etc. But in MA it seems that a lot of the leeching behavior has become so common that few people question it anymore.