I pass up many books for that reason. I'll skim a couple of chapters and realize I already know the information, or I already own an unread book on the same subject. I want a house that (in addition to all the usual rooms) has a Library. (And a sewing room and a Rialian room and a workshop with tools and a root cellar and a basement and a dusty old attic and Real Hallways with Secret Passages and a Secret Garden and...). Uhm, and is sustainable! Right.