[Leto]

For me it depends. Beautiful books (the one printed on very thin paper called Bible paper) are treated with lot of respect but read on a regular base. All the others favorite are read, repaired and re-read because I live with them, read them all the way, and some were passed along to me in that state (usually by my father or due to second hand buy). I like book which show they have been read (because of writing on the page, although I don't do that myself, of an old postcard or receipt used as a book mark or so on...)

For me, book are made to be read and should be passed along once you sure nobody around you will read them again. I must have a collection of roughly 2000 books currently, but there only 100 of them I'm sure to keep (because I want them to be part of my will) and 900 more that'll stay on my shelves as they have strong potential for a re-read. All the others will be resold or given to friends or even - for some paperbacks - intentionally lost in the subway (as originally I got them).