Most likely is the transport cost..

Nearby the airport got nothing also.. Making transportation cost to that area would be more than other area.. It is like prime are like Pavilion, KLCC, both places are so close that the transport fee can be minimized.. Because of more business in the prime area, the transportation cost could be lowered..

Likewise, there is not much retailer in KLIA area, those who deliver goods to that area will always tend to charge higher in order to yield higher return..

Same like Genting, you need to transport those goods to mountain area.. It is not cheap..

And mostly Malaysian did not dine nearby the airport area..

Less customer in Airport, medium rental, compare to More customer in mall, high rental..