I cannot understand why someone would buy a pair of plastic sunglasses that cost the same as a Go Kart electric trolley. It has to be the biggest rip off, pound for pound, ever.
There is no amount of engineering, technical know how, or advanced design that can turn a 5p blob of polycarbonate into something costing 100 bucks or more.
Like the Emperors new clothes, I have said it before and will keep saying it - it's a con!
You are paying for a clever perception, dreamt up by American advertisers. Just another example of 'Snake Oil' branding. Target market, spoilt rich kids allowed to doss around surfing or snowboarding where the badge is everything dude, just to show your mates how rich your over indulgent parents are.
The credibility just spills down to the rank and file who then believe that because it's expensive it must be good.
... but I'm British not American and not that stupid!!!