Goodwood are quite right to charge whatever they like. Everyone can choose whether to go or not. If no-one went the price would be reduced.
This is VERY simple market economics.
The choices are -
1. Don't go
2. Go by bus/train/car and pay less
3. go, but moan about how much it costs and ruin your enjoyment
4. go, and enjoy it (and maybe fill your seats, as suggested)
also maybe...
5. fly in, but take a two seater