Very true, time is paramount when reading-studying chess books.
Chess Book Addiction

"Remember, if you like books--like reading them and owning them--there's no such thing as 'one chess book.' ... as you acquire one or two and read them through--even if you don't--you'll find yourself drawn to the chess section every time you walk into Walden's or Barnes and Noble or Borders. If you leaf through the books and compare their contents to what you need, you'll soon find yourself dedicating a shelf or two of your bookcase to chess books. You'll want to have all of Sierawan's books (as soon as they're back in print). You'll yearn to complete your collection of Alburt's series. You'll start haunting used book shops for old copies of Fischer's 'My 60 Memorable Games.' Your hair will gradually grow unkempt, and a distracted wild look will creep into your eyes. If you're separated from your books for too long, your hands will begin to twitch and you'll start plotting knight moves across the checkered tablecloth at the Italian restaurant where you're supposed to be wooing your wife / girlfriend. You've entered a perilous zone ... 'Chessbibliomania' is not a condition to be easily dismissed, and research has shown it isn't curable. Maybe you'll be better off just buying a gin rummy program for your computer and avoiding this chess book madness altogether. Happy reading!!"
http://groups.google.com/group/rec.games.chess.misc/msg/d96eccf5ddec3c33
YES! Oh god ,you know, I'm not the only one.

I have a partial chess book addition but then i realized why keep buying books when they're not gone through in detail. Just buy and store in the bookshelf is not good in my opinion. Books should be gone through atleast partially throughout. On the other hand. It's exciting to get a brand new book in your hand. Latest New In Chess Yearbook for instance 😀
If you do not study chess seriously, then I must say from my experience that books have a tendency to end up on the bookshelf to stay there for quite some time before you take them out again.
It is fine to have many chess books, they reflect a potential for learning and getting better skills when you may have time available! It is like a mental protection if you do not feel like a sure winner of your next game. You may ask yourself this question when tempted to buy another book (new or used) am I have the time to read it and make a serious use of it? If the answer is NO, DO NOT BUY IT!