Why are Caterhams so expensive?S

The cheapest model starts at 29,580$, and that's without an engine and transmission, so as far as I can work out you're paying nearly 30k for a body with almost no interior and some suspension that you also have to put together yourself. I feel like I may be missing something because I doubt it costs that much to make the chassis, body panels and suspension bits even factoring in cost for development.