Because the market for 4 door, full sized sedans that can comfortable seat 4 people is limited, especially if one wants good performance. I could have gotten a four-six year old E55 for the same money, but then it'd be four years old out the gate. So getting close to some seriously expensive service intervals. Perhaps not seriously expensive by Ferrari standards, but definitely eye openers. And it'd be outside warranty, and no matter how much you inspect, you can still get burned.
So I basically purchased the same car, new with a 6 year, 100,000 mile warranty, and traded off for a more plasticy interior. I suppose it's not as bad as I've made it out to be; it's certainly nicer than a bargain basement Aveo, or even my wife's Scion, for example. But it's not as nice as a Merc E55/E63/CLS63
Steve