I have a Parker 2520 that I love and have spent a solid amount of time on Radons, Andersons, Davis and many others. The Parker and all the other production boats I've been on are a significant step down from a Radon.
Radon (and others) use a completely different process, resins, and other materials than production boats. Yes, both use fiberglass, wood, etc but the end result and costs associated with the builds are completely different. Is a Radon more expensive, yes. Is a Radon overpriced, not at all.
You see a lot more Hondas than Mercedes on the road too, but that doesn't mean that the Mercedes is overpriced or a bad car, just more than most need or can afford.