This reflects what I know about libraries. My mom was a librarian and if a system is at all well run it's responding to aggregate needs and desires of it's patrons. Libraries churn through a ton of low brow fare and also do a ton if work serving immigrent communities, job seekers, kids and the elderly. There is always the chance that your library is poorly managed. My Mom fought to buy 10% less of the shit you could get from a red box to spend some dough on more thoughtful stuff. A copy of Koyaanisqatsi will circulate a few times a year, a copy of Game of thrones will be in circulation as soon as it gets on the shelf. There are two compeating theories or at least there is balance that must disatisfy some people some of the time either way you go. You can go for maximum circulation and stock mostly stuff that's hot or you can currate a broader selection. It's expensive to give the people what they want. A hot DVD is garbage after a few months, popular books won't last a year.