You claim that NDI in Shanghai is badly run. That's just your opinion. Whether it's true, is another matter altogether.
NDI opreates as a franchise. Branches in other Chiense cities, such as the one where I'm the academical manager, might well be run much better. That's part of my responsiblity, to assist the owner increase the number of English learners here. to do this, we need real teachers here, not scruffy backpakers! As it's demanding work, the pay is rightly way above average.
I've not named my branch, so as to not be accused of advertising by you training center bashers reading this.
Don't tarr all of NDI's branches with the same stick, and don't bother applying for jobs with us if you're a slacker. We don't need those who are afraid of hard work, they'll be found out and let go after a week or two!