In my experience, Levi's and other "quality" jeans last long enough to go out of style (5+ years, much to my wife's chagrin), whereas cheap jeans fail in the crotch and/or pockets in under a year. For a few years I switched to cheap jeans and just repaired them when they ripped, but you can only sew up a pocket so many times on really cheap fabric before they are so thin they won't even hold a stitch.