Of course they're wonderful in the way that used-clothing stores, tag sales, and recycling in general are wonderful: We're saving the planet, saving resources instead of throwing out the old and chopping down trees or digging up minerals to make new stuff, and saving money. Plus, we're discovering hidden gems rather than following the newest ads.

BUT -- Please remember the authors like me: When you buy a used book instead of a new one, you are taking away our income. So....please try to buy a new book (from an indie local bookstore, written by an unknown author) now and then. Thank you.