In HK you might get away with paying 10-15% tax, but if you have kids in school (international), want a decent apartment, like to eat out a couple of times a week, Ocean Park, Disneyland, Concerts, other outdoor activities, there goes a large chunk of your salary, more so in HK because these things are considerably more expensive and no better quality than any other western countries. Just like the gulf countries.
I don't buy into the "my tax is lower than yours" argument because you just end up spending it elsewhere.