Batman is an anti-social billionaire cock who's too hung up on the past to enjoy some time to himself. He's out of touch with what makes for a good time, and would be better suited to shut down such a popular nightclub.
Iron Man, on the other hand, is a wealthy, poontang-driven, alcohol-fueled sex-machine. Sure, he's got problems too, but they are remedied soon enough, so as to not take up any more of his sweet precious time better spent on sexual conquests that would make the likes of Hugh Hefner, Wilt Chamberlain, and Charlie Sheen ignite with jealousy.
In conclusion, Iron Man would create a temple dedicated to living life his way. Starktech audio/video entertainment systems are just the icing on the cake.
Hold your tongue, witch! Iron Man parties like a rockstar. Batman almost certainly never parties, and he doesn't drink booze. Who the hell wants to be around a quiet, creepy, sober guy at a party?