It's all about money, money, money... Esp. "training" of ANY sort is a major cash cow in N. America.
The cost of medical school for example... is it really justifiable? I don't think so.
Or even a simpler example - what about the cost of university text books? That Anthropology 100 class you have to take to fulfill a prerequisite, that stupid text book you'll read only half of, and will never want to look at again, can cost anywhere between $70-150.
And of course the next semester, the instructor CHANGES the text book, so you can't even sell the damn thing now.
Take any career, vocational training... pumped up with bullshit tuition and other fees.
Greed is everywhere. If you're not in, you get screwed ALL YOUR LIFE.
So why should it be different for some overhyped up form of yoga?