I think there are two kinds of expats out there. The ones who want top dollar no matter what reasonable location it takes them to and how long they have to stay there and the other is the one who is willing to take lower pay because they insist on being able to get back home regularly.
I'm sure if Korean and Emirates offered both top dollar and good commuting, the flow would be to Emirates. It would be my preferred choice of the two if they both had the same terms, but they don't.