After spending quite a bit of time hanging around in establishments at the top of tall buildings, I have realised that a pattern is emerging.   The higher up in the sky you are, the worse the service usually is.  Which is a shame for many reasons, not least because most of these places seem to implement a kind of “sky tax”, meaning you pay through the nose for the privilege of being there.  True, the views are spectacular so at least you have something nice to stare at while you wait half an hour to get served at the bar (Hutong, I’m looking at you).  However, is feeling like you’re…