I understand what you’re saying, but can you imagine if, say, those aircraft were all parked along the disused runway where the Lanc parked on Sunday. It would be a nightmare shifting barriers (and crowds) to allow aircraft in and out, it just wouldn’t work.
Believe me, the regulations defining what constitutes a display and what constitutes a flypast are very strict – the screws were particularly tightened after the Nimrod crashed at the Toronto airshow. I’ve felt very foolish (not to mention fraudulent) in the past few years flying past a crowd of eager punters in my Sea King (always best flown low!) at 1000′