If you are by any means actually a decent teacher or holding real qualifications of any sort, you may find yourself ruled out for the 'DoS' job on the basis that you are overqualified.

I have had that happen. I know of a few dos'es who do not even have degrees, or a degree even remotely relevant to the english language. The whole thing is an outrageous scam, and parents, students and teachers alike are being ripped off.There would be an outcry if there was a cartel like these training centres in any other area of business, yet somehow they are getting away with it.