It's actually $30,300HKD which gets you a 2 bedroom apartment in Dubai, ok it's bigger than your place in Hong Kong but it's still only a 2 bedroom apartment. Then the salary of $30,125 (63,900HKD) is some $17,000HKD less. Even though it's tax free does it work out you'll be super rich? Doubt it and you still need to live in the Middle East