So I did a bit of research. Tickets cost over 400$ each, no matter where you camp. But if you come with a vehicle, you also need to buy a ticket for that, which is 100$. That being said, the festival only funds itself from the ticket sales and relies on the work of volunteers. There's no advertisements or brands involved whatsoever. Also it's a whole week (we have festivals in Germany that cost around 300€ for just a weekend)
(honestly curious, but I couldn't find a nice way to ask without sounding condescending)