When I was younger, I used to think the Shard was daylight robbery. But 16 quid for a signature cocktail and a view (or 12 for a spirit + mixer) is no longer outrageously expensive in London and you'd pay that to go up a skyscraper in many countries anyway. Both Rockefeller and the Empire State are $40+, though you can go outside. Even Aqua Shard, which is apparently in the Michelin guide, "only" charges about 20. Which is bordering on outrageous, but the view is great.
Agree it's worth going up there.
Though while the bar is reasonable, Aqua Shard is overpriced if you're going their to eat (the food is good, but you can get better food for the same/similar price elsewhere, including at Hutong, one floor up).
But if you're going to a bar in the Shard, Gong (52nd floor), Ting (35th) and Hutong (32nd) are all higher up. Gong and Ting also has the advantage that you don't have to pass through that ridiculous security scanner (entrance is via the Shangri La hotel)