The Oakley C Six Sunglasses are individually machined from block carbon fiber, machining hours for the glasses are around 70 hrs per pair of glasses....
The glasses also have a mult point radial hinge along with HDO polarized lenses for better fit and vision and are packed in Oakley's elite case.
All in all, you arnt paying 4000 for a pair of glasses....you are paying 4000 for a status symbol
Kinda like buying a 12000 carbon road bike or a 1,000,000 car..... all overpriced dumb and expensive, but...they are made cuz people will buy them. haha..