@Exnomad
There are also a lot more people at the Bournemouth air show, around 1.4m over the 3/4 days. From what the announcer said it was around 500k on Saturday. They were talking about cutting Vulcan one day to try to keep crowd levels down. In terms of revenue Shoreham won't be getting any revenue if it's forced to close!
The risks are much higher too though. Those people are all lined up in parallel with the display line, and densely packed. Were that Hunter to have done that pancake landing and explosion on Bournemouth beach it would have made a huge mess. It's also fairly slow getting ambulances along the seafront due to the crowds.
@charliegolf
They did accept the higher risk of using the road, and of travelling past an airport.
@Fluffy Bunny
The Red were flying from Exeter and doing 2 displays so it might have been too far.