Data I wish I had

At Walnut Bluff and Mystery Library, I find time to ponder all sorts of mysteries I never spent time thinking about in other library systems where I've worked, because only Current System is so poor/stingy that I end up doing tasks that give me lots of time to think, like:

• Picking up trash in the parking lot every day
• Taking pictures of the "library" road sign that points away from the library 
• Checking the bathrooms to see if the supplies have been stolen yet

 Anyway, while I was chopping legal-sized color paper down into letter-sized sheets (you've got to stretch your office supply budget how you can!) I thought of some data I wished I had that I don't, such as:

• The average (or median) 'lifespan' of a library book: how long between the date it arrives at the branch to the date it is either lost/stolen or withdrawn?
• How much being put on a face-out display stand helps a book's circulation. Does it make it twice as likely to circulate in a given month? Ten times as likely? Does it matter what section/kind of book it is?
• How many unique individuals come into the library each day? (We have a door counter, but it's skewed by the guy who is on the computer for 5 hours every day but goes out every 15 minutes for a smoke break, and by my staff, who for some reason love checking the drop box out front and empty it like 10 times a day.)
• How many rolls of toilet paper do we go through per month? What about printer paper and receipt paper? How much money are we spending on that stuff?

More things to worry about.