Why Carbon Mirror Caps? (vehicles, replacement, cost, car)

[Exitus Acta Probat]

Carbon is a durable, lightweight material. It's also fairly expensive.

I was therefore wondering why it is that some high tier performance vehicles have carbon mirror caps, without having much of carbon anything else? I can understand if a car has lots of carbon, then you may as well go ahead and carbon the mirror caps as long as you're doing the hood, trunk, and fenders, etc., but if you're not doing all those things, why bother with the mirror caps?

[LeagleEagleDFW]

Cosmetic appeal.

[Tourian]

Because real DOT approved direct replacement powered, heated, blind side alert and turn signal embedded mirrors would cost a whole lot of grip.