Do you have multiple copies of any of your books?
If so, why? Absent-mindedness? You love them that much? First Editions for the shelf, but paperbacks to read?
If not, why not? Not enough space? Not enough money? Too sensible to do something so foolish?
At the moment I have two copies of one book, but I think that that is about it! That book is A Hunger Like No Other by Kresley Cole. I bought it a while ago, and then I won a signed copy over on Dear Author so now I have two. I think I have a home for the unsigned copy but I am just waiting to hear for sure!
As for why I don't have more, there are a couple of reasons. I have no room or money to buy on multiple copies, and also I keep a spreadsheet so that I know what books I already own so I don't accidentally buy two!