If you promote 'job hopping' it only makes life harder for the rest of us. It is hard enough getting Chinese schools to trust teachers without people running all the time. (Chinese schools treatment of teachers is a valid concern of course, and I am not condoning some of the terrible things they do).

The answer is, as Yingyu Laoshi (correct spelling in PingYin!) says, is to NOT SIGN if you are not happy.

Don't come over to China knowing what the wages are, sign a contract and THEN complain you don't get paid enough. Who's fault is that? Yours!

S.Korea pays more, some I hear, if you come to earn good money (by western standards) then try there.

Otherwise, don't complain. No one forced you to come and work here did they?