Rents near the airport start at 25,000 Hong Kong Dollars a Month or $3225usd. That is for a small 1000sq ft (100sq meter) apartment in Discovery Bay. The nice expat life in the city is not possible on that salary. See for yourself.
I was in tung Chung today and saw rent for 1000sq apartment for $13,000. Before you start on about tung Chung etc, I would rather live there than DB anyday.