We have bought books from Amazon for years! I think it's great that books can flow from one owner to the next and keep being valued. If you notice, I have listed some really great bargains - I'm not sure I'll receive anything back from sharing these except for the knowledge that I referred you to something worthy.
Of course, other books are a little more costly but worth it! We have our share of paper backs but then again we have quite a few of hard covers too. Some books you just know you're going to enjoy for years and years and it's worth it to buy the best.
Anyway, just thought I'd let you know, this isn't all about what I'll get out of this myself. I am truly making suggestions that I know will enhance your home.
Blessings and Happy Reading!