But the A380 was not built for such a reason. It was built to take 500 pax over crowded routes to crowded airports with even more crowded slot times i.e. LHR and it was designed to do it cheaper than a 744 can.
Actually it was build and certified to carry 850 passengers around. Of course that would be a one class layout and you cannot carry those nice first class suites around simple because you don't have the space to do so. It is each airlines decision how many seats you wanna put in that beast.