Dunno, but just guessing here....I doubt the organisers will be that bothered about "potential punters" who won't cough up a few quid to attend an event where bigger money is at stake?
I'd have thought they're after sales of helicopters/parts/servicing rather than entertaining folk who are unlikely to buy/hire services?
Shoot me down if you like, but surely it's a simple case of economics?
Those who can will/may, those who can't probably won't?