I'm sure it is very hard on them. But.....It used to be that you could take Oakley’s into any point of purchase and they would warrantee all parts unconditionally. Not anymore. If you sweat at all (and who doesn't in the summer) the nose pieces and rubber ear pieces last a season and then turn to gooey mush while the lenses scratch so easily...and it usually is right in front of the master eye.... one piece of brass bouncing off a close wall will do it. That's what did it last time, and I would usually end up replacing a set of lenses every two years and none of that stuff is warranted. The frames become brittle usually over two or three years and end up snapping in half on the stem/s when you simply take them off, and then since they only warranty for a year now you are screwed for a set of frames. I started carrying my Oakley's in their padded hard case and using them only for shooting, treating them with kid gloves and babying them. Sure they lasted longer, but the rubber bits still rotted off and the frames broke. I had two pairs and still have one that have been basically unused for the last couple of years so for now they seem fine. I dunno, it they are that fragile I don't think they are worth the money they charge. Maybe if they cost 30 bucks they would be worth it, but not at $200.00+. The metal frames I have now are very low profile (not like the Oakley's) and light, and will never snap in half. One full season plus a half into them and they still look new.
Suffice to say that once these ones cack on me I won't be replacing them. But hey, everyone has their own set of critieria for what makes a product great.