People offering courses have always been a bit of an interesting aspect.
Maybe I am lucky, and the ones I have been on have been useful, I have learnt something.
Maybe not a system I would want to trade, but I always take away something new.
Ultimately, we have to find our own way.
But I understand your point. If I could earn a lot of money trading, I wouldnt really put myself out to train others.
The rigmarole of advertising, websites, printing manuals, booking hotel conference rooms, then support or replying to peoples emails, etc, sometimes employing people to cope with the admin, etc etc.
Too much hassle.
I would rather have less money and trade, than the hassle and a bit more money.
Sometimes in my more cynical moments, I do wonder why successful traders would want to teach !!