It's great for the library's circulation numbers when patrons check out numerous items, but there's a difference between someone using a lot of materials and someone who's a "library hoarder." For instance, it somehow irks me when a patron checks out a dozen DVDs and asks to renew the dozen DVDs she already has out because she didn't have the time to watch them. I can't help but wonder why she's bothering to check out more DVDs when she still hasn't watched the ones she checked out previously. It reminds me of the time when my cousin kept shouting from his high chair for more corn when he had a plateful of corn in front of him.
Some patrons come into the library knowing exactly what they want to borrow while others decide what they want by browsing. I hate to think that some patrons may miss that exciting unexpected find because someone else is hogging items. Now don't get me wrong, if someone is actually going to watch 28 movies in a week or read 53 books in a month that's perfectly fine, but if that person keeps renewing those items and checks out more, that's plain gluttony.
So if you happen to be a library hoarder, take a moment and think about your fellow patrons. Is it really fair to others to have library items just lying on your kitchen table when someone else may get some good use out of them? Remember--sharing is caring, and libraries do both. Don't forget to care about other patrons and share all around.
Just my 2 cents from the perch.