These training schools give children the chance to interact with people outside their culture. They are presented with different ideas and help them to see the world outside of China. Their are bosses who recognize this, although that number might be low. The secret that these teachers impart is how to communicate in English not just pass a test, which more and more people are wanting.
A person can not deny that the regular proximity to a new idea, approach or belief will have a great impact on how people see the world. That is what training schools do, if they are effectively run and managed. That responsabilty falls squarely on the shoulders of the foreign teacher. They have the choice to work at a place or leave it. If the Chinese boss does not agree then obviously that place is not suitable for education and the individual themselves must walk away. However if there is a place that values the foreign teacher and contributes to the education of the students would it not be better to support that place instead of lumping it in with "all crappy schools".
I have had an chance to deal with foreign DOS's who tried to pull the wool over my eyes for their own benefit, and ultimately I walked away knowing that those type people will in the long run suffer from their avarice. I have also had the chance to work with some dedicated people who refuse to screw others over and I have stayed solely because their goals and mine matched.
If there is to be a list of crappy schools please temper that with a list of schools that do well in serving both the students and the teachers. Now before you say that is impossible realize that generalizations are not accurate and do not reveal the facts.