It´s true, that it´s just an illusion that there would fly first class hotels through the sky, but in this times, you need somethig to get the people wondering about. If Airbus just announced "We´ve developed the biggest and most economical aircraft ever" no one would have had taken care about.
But if anyone is talking about the aircraft, and every newspaper and tv - news is full of it, it is an inducement for airlines to buy it and to provide passengers with that plane (not with that interiour, most passengers can´t afford).
In my oppinion, all that pics of the super-luxuy-bird were just an advertising strategy of Aribus.