[SpaceManNabs]

> Also — secondhand books are generally outdated, undesirable, and/or damaged — do collectors still find diamonds in the rough?

Growing up poor, second hand book stores were how I found some of the best math books that I wouldn't have been able to afford. And they were often quite good or better (at least in offering diverse perspectives and angles) than the books I could have bought at the time.

I often liked the notes people left.