
The short answer is: because they buy back my books and cash in my hot little hands always make me super happy.
When Tom and I first met, we use to buy our books from Barnes & Noble because we had a B&N card which saved us 10% on each purchase. And when that ran out after a year, we bought our books from Costco. Then when we got married, we registered for a few books on Amazon.com and had been recycling the store credit from the registry ever since. In the summer of 2007, we did a massive overhaul of our stuff and sold about $400 worth of books to Powell's. Most of the big ticket items were Tom's fantasy and sci-fi books in paperback and we donated the rest to Oregon Women Lawyers (OWLS).
In an effort to make *more* room for the baby, I recently cleared out all of my German literature books. These are the ones I kept from college with the intention of going back to the language or picking up a German poetry book to read one day when I had free time (ha!). Ten years passed and I did not once open up these books. I really didn't think Powell's was going to buy them back, but to my surprise, they bought all but two. I was able to exchange this one box of books for $47 cash or $57 in store credit. I opted for store credit this time and exchanged it for "Healthy Sleeping Habits," "Baby Bargain Books," and "Lonely Planet's Alaska" (2009). A box of books that had been sitting on my shelf for 3 books on my wish list, plus $10 store credit? Not a bad trade-off I say!