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Gotta call bullshit on the 'whole different league', at least in the case of oakley vs foakley (IMO, anecdotal, n=2, etc...). There are differences in the lenses (thickness and scratch resistance being the most notable, minor optical differences if you're really looking), but they are no worse than any other £10-15 pair of sunglasses and definitely not ~10 times worse, the price of oakleys implies.
I've said it before but the main difference is the quality of the lenses. Fake ones are in a whole different league.
I've got some Bloc Titan's at the moment and they're still pretty cheap but the optics are just as good as the real Oakleys I've used.