According to Vashik Armenikus, reading and book collecting becomes an obsession/addiction when you do it indiscriminately, without thought, without taking into account the bigger picture.

Smith-Corona (SCM) Font Styles – To Type, Shoot Straight, and Speak the Truth… by [[Theodore Munk]]

An association copy is a copy of a book which belonged to the author or someone connected to them or a copy of a book that once belonged to someone particularly associated with its contents, often annotated.

I've got association copies of some information theory texts...

Any book collector worth their salt will already have in mind the way they want their collection arranged. Only someone who wants to use it as wallpaper would have a service arrange it.

I wonder what the other two cases were?

David Quammen on Books

Of course anyone who truly loves books buys more of them than he or she can hope to read in one fleeting lifetime. A good book, resting unopened in its slot on a shelf, full of majestic potentiality, is the most comforting sort of intellectual wallpaper.<br /> —David Quammen (1948 ― ), science, nature, and travel writer in The Boilerplate Rhino: Nature in the Eye of the Beholder

Syndication link: - https://boffosocko.com/2016/08/03/intellectual-wallpaper/