It's not random, it has a purpose. If they need people in the hangars and that's where your preference is then you'll get a tick, can you actually reside in Dubai without them having to worry about you getting visa's etc, then another tick in the box. How much do you expect to earn, 100000 whatevers, they have a limit of 80000 then no tick in the box. That way they don't waste yours or their time setting up an interview.