I do this a different way. I think about how much I'm going to use something and try my best to over-invest in what is typically cheap and could last years and under-invest (or avoid all together) in what is expensive or could last less than a year. Pen: Very expensive. Sunglasses: Very expensive. Phone: Very expensive. Laptop: Very expensive. Shoes / most clothing: Midrange, since they don't last long, but they're n…
> Sunglasses: Very expensive. This one is confusing. Sunglasses are 90% fashion. What exactly are you getting with an expensive pair? I take the opposite route. Cheap sunglasses that I'm unconcerned about dropping, sitting on, or leaving behind.
Not the ones I buy. I mean, yeah, there's a lot of fashion in those Oakleys but there's a lot of function, too. They don't slip down my nose, the lenses are coated and don't collect as much crap, and the frames don't snap after a year. After fifteen years my oldest Oakleys are still going after less expensive sunglasses have broken or proven unsatisfactory. But those sunglasses also have to stand up to a life of trail running and hiking.
OTOH, if one is just looking to keep the sun out of the eyes while driving, $250 sunglasses might be overkill.