Not that I really believe you are a Chinese recruiter,any more than I believe that the other person who posts in this forum is a Chinese employer. But just for fun here's my response.
Most ESL/EFL teachers who come to China do so with positive intentions. Also, teaching in the States for example has a high burn out rate. Statistics show that burn out comes between 2 and 4 years. Why? Because teaching ESL is a demanding job, not only due to the hours one must spend preparing, for which you do not get paid generally, but also because it can be emotionally draining. Most ESL teachers in America are very compassionate individuals who get seriously involved with the flow of their student's lives. It is common to teach individuals whose lives, before they came to America, were filled with suffering or hardships, and because of that our hearts go out to them and we try our hardest to make their lives better.
Ultimately, the burn out leads to the search for another job or the idea of teaching abroad as a means of somehow rekindling the passion for teaching. Unfortunately, what we have found in so many cases here in China, and elsewhere in Asia, is that one's word does not seem to have value when it comes to recruiters (generally speaking) and often employers. I have had to deal with this issue personally and I've yet to meet a teacher in China who has not had to deal with it in either a small way or a large way.
Eventually,the government will step in and create a watch-dog agency of some kind. And, if we teachers are lucky, they will find a way to punish the offenders and reward those who act honorably and follow through with their promises.
If you yourself have had trouble with teachers and their continual demands, then perhaps you are not honoring your commitments. If you are, then you only have been unlucky enough to deal with the lazy slobs who came here thinking it would be a free ride. Admittedly, there are some of those around also.
Either way, I suggest that most teachers who come here do so with an open mind and an open heart and some are easily taken advantage of. However, be aware that the word is getting out. If you are not one of the honorable ones, you or any recruiter or employer who is reading this, better make your riches quickly - soon enough it will be too late.
Good luck............