Dave it is not that expensive compared to other quality wheels. In fact I'd say on the cheap side. This is a well-designed wheel. First of all, the spokes are many and thin, that makes the wheel strong, and light. It is super "open", allowing good cooling for the brakes (less heat retention by the wheel), and really shows off quality brakes. It's one of the lightest wheels I have seen. Lighter than NSX-R wheels in the same size. It's very concave, which allows for good brake caliper clearance. Performance designed. The fact that it looks good is a plus, not the main selling point to me. It's rare to get this combination of looks and performance at this price point.
I think Advan really has their shit together. They don't waste money on unnecessary blingy and costly stuff, they do what it takes to make a quality wheel. Personally I dislike (always have) wheels with fat lips, chrome, rivets, etc. Way back when no one was doing concave and everyone wanted a fat lip I had posted how I didn't like that trend. Now "concave" is starting to go the poser way, big compromises in performance are being made to get more concave. To me function should always dictate style.