Camping at the official Goodwood campsite for the Festival of Speed this year was £175 for a pitch ! If what I was told was true.
We camp at a small quiet campsite about 4 miles away so its only a 10 minute drive from Goodwood. So if you want to camp, look up The Lillies at Barnham
http://www.lilliescaravanpark.co.uk/Its about £15 a night for a two man tent with 2 people.