The Waddo show was 'supported' by the RAF. The Coningsby one was not. While I ran one it absorbed all our working time for a few weeks. As Burn said, it absorbed at least 4 days from everyone else.
At Waddo before it took over from Finningly I asked several airmen - air show, or £20 a head and a free weekend. To a man it was £20. Times that by 2,000 and you cleared £40,000 for charity, no sweat.