The only reason I can see that more have not left for China is due to interview or medical failures because if you are selected for pretty much any Chinese job it is clearly many fold better than working for this mob.
Fatigue is considered a serious issue in China and it will be rare that you have less than 3 days off per week and normally contracts will give a block of days off as well, leave will be correctly honoured. A typical contract will pay 18k USD and that would be a flat rate up to about 78 hours flying. Cost of living and accommodation is not more than about 50% of costs in Dubai. Education is expensive in China but Hainan for example will meet those costs, other Airlines won't. On balance however for Captains aged 52 or below China is the place to be, not the UAE or Qatar.