[rendx]

> secondhand books are generally outdated, undesirable, and/or damaged — do collectors

I buy up to 10 (mostly non-fiction) books on paper a month, always secondhand if available, via bookfinder. You typically get a very accurate description of their state beforehand; I don't mind most levels of use, I actually like it when they have history to them. Markings, notes of previous owners, etc, are all fine for me. Even if one prefers "clean" books there are usually plenty of copies available. I like how it is both much cheaper than new, and even more the reuse aspect.