Sigh* you guys have your opinions, I respect that, but I have to disagree. Yes, I KNOW it sometimes is used as style points rather than for performance. But the next time you think, "oh, how much weight could that even SAVE me?" Well, look at the performance cars out there. If the manufacturers kept thinking the same thing, we'd never have beauties like the 360 Challenge Stradale, or the Nissan 350Z. The carbon trunklid is something fresh to me, and I like how it looks. And NO, not all people that don't get their CF painted are show-offs. Some don't bother to paint it because a) it saves money b) saves a pound or two. And little things add up. Take something simple, like a Nissan 1991 Sentra. Lame, right? If you're not going for looks, Carbon fiber parts can save you almost 30-40 lbs. Combine that with something like takin the rear seat out and voila: instant 150 lb. reduction. That turns into: better gas mileage, better accel, better power/weight ratio.
True, something like that is reserved for the hardcore, but I wouldn't mind putting one on my car. It looks, good, saves weight, and IMO is the better choice.