That's exactly what Oakleys are though. They are basically Ray-Ban lenses in a different shaped frame, and marked up 100% over what they should cost.
Oakleys are the Bose of sunglasses. Their price tag makes people think they are quality, rather than their quality justifying the price.
edit-Christ, just looked up Ray-Bans, had no idea that most were in the $150+ range nowadays. Put them in the same category as Oakley too then, Sunglasses that are at least twice the price of what they should be based on their actual production quality.
I think if anyone here that regularly wears Oakleys had the opportunity to swap them out for some Maui Jims, Costa Del Mar, or the Smith Tenet's mentioned above, you'd be amazed at the difference. Yeah, standing at a mall kiosk in artificial lighting and trying them all on doesn't really show you how much of a difference there is when you get into natural sunlight. Oakley just makes things darker, which is what most people expect out of a basic pair of sunglasses. Oakley does the same thing as a $10 pair of sunglasses from Wal-Mart, the're just in a fancier frame with a popular logo on them. The brands I listed above don't just darken your view to reduce eye strain, they reduce eye strain by blocking glare while making colors more vivid, rather than being washed out in bright sunlight. You'd be shocked at how different they look in outdoor use.
Look, I don't want to sound like some sort of retarded sunglasses elitist, if you just buy sunglasses for the way they look as a fashion statement, then buy what you think looks the best. But if you actually want a pair of sunglasses with the best lenses (reduce eye strain while not altering/drastically darkening the world around you, actually enhancing vision), then look into the brands I mentioned above.