For instance, I can fly from LAX to Sydney for, say, one thousand dollars in economy, or (goes to check fares) sixteen thousand dollars in First Class. That's a thirteen-hour flight, so you're paying more than a thousand dollars an hour for whatever extra pleasure you get by sitting in a nicer seat, eating a nicer meal, and being brought drinks by a prettier stewardess.
Alternatively, I could eat at the best restaurant in town for $200 and then go and sleep in a fabulous hotel room for $500. That's a far better pleasure-quantum-per-dollar ratio than anything you can get in the air.