I can totally relate to this article. My college library would sell books it got from estate sales but didn't want. I would hang out in the library with my laptop looking up ISBNs on amazon. I found a few gems and sold a cake decorating handbook for $150. I can identify with the feeling of shame. I think it is a noble job, but something felt wrong about skimming books only for their monetary value. It was an irrational emotion, but it was hard to shake.