I don't think people particularly want to live in HK, I think they get sucked in by the illusion of high pay, low tax, give up what turns out to be a decent job in their home country and by the time they work out that honkers is one of the most expensive, polluted s**tholes in the world, it's too late.
Let's face it, if the pay is so good why are so many pilots poisoning their families still after 10,15,20 years ? Surely they would have saved enough to retire and go somewhere healthy ?