Not everything boils down to a simple formula of incompetent instructors and evil agencies.
Of course not. The OP obviously has some concerns about the level of training given.
You've agreed that "It's possible that too little training is worse than no training at all...." and "I know of at least one shop that was shut down because of accidents they were having." Obviously there is concern about how some training is being presented.
You mention that "To a shop, a training course is a product that they sell for profit. If a business isn't trying to make money there's something very wrong. The *good* ones will strike a nice sweet balance between price and quality and customers will leave happy and come back." Unfortunately, they're not all good. Profit often outweighs "the balance." That is a concern that is shared by many of us.