A guilty conscience
I am poor pragmatic, so I use the library to get almost all my books. This usually works out really well, you go online, find a book, click a button and they send it to your local branch. Easy.
Sometimes, though, I want a book that's popular, and the waiting list is 40 people deep (apparently everyone loves Obama) and I'll have to wait months to get it. I don't like waiting, so I have a little trick: find the large print edition. Those are the copies for the sight impaired, nice big fonts, easy for my nana to read. The large print books are listed separately from the regular versions, so less people find those listings, and less people reserve them. I usually get them right away.
There are times, though, when I'm easily reading my large print copy of The Omnivore's Dilemma at arms length and I picture some poor guy with coke bottle glasses trying to read a regular sized copy under a giant magnifying glass. Sorry about that my friend.