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It's all down to cash. Most airlines want to shove more pax on a plane, and they want them to spend more cash. This aircraft is so big a few airlines are going to have casinos on board.
-All this is controlled incidently, by a small joystick, such as your 6 year old child would use, to crash planes on MS Flight Simulator.
And if you think getting the pax are going to be just spending cash on the aircraft, think again. Emerates have 36 orders for the A380, it's going to be a taxi service to it's terminal in Dubai to spend even more cash. The airlines who are doing the same as this such as Air France and Lufthansa aren't pleased about this, but who would want to go to Charles De Gaule to spent cash anyway? IT'S A TIP!
Overall thought, this aircraft is going to revolutionise air travel, because most airlines arn't going to fill it up with pax, (Which is a good idea, because they'res always 10 or 20 who never turn up for their flight, or come at last minute) these planes are so big they are going to fill them up with aminities.
So really the A380 will serve as a pleasure plane, until airlines need the space for seats in the future, saving them a bombshell.
They don't build aircraft without doing the maths.