My last pair of raw denim has only lasted eight months before the crotch has begun to blow out. I wear them pretty much every evening (I wear suits during the day) and have only washed them once (after purchasing and before wearing, to set the dye). I pay a premium to get raw denim, and I love the fit, but it seems unacceptable for them to wear out so early. Is eight months reasonable? Are my expectations too high?