I hold on to expensive sunglasses longer than cheap ones but I also get more annoyed at the inevitable chips, scratches, and other defects that tend to accumulate (no matter how expensive, actually storing glass in a case when not in use lasts only about 45 minutes after purchase).
So, in the end, buying expensive sunglasses just results in me hating my sunglasses longer (because when you spend $200 I'm not going to get a new pair just because the temples are a bit twisted).
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