I have cut my record collection in half several times, due to moving into progressivley smaller spaces. Got rid of things I had outgrown and thought I would never want to listen to again (e.g, Gentle Giant, Roxy Music, Tangerine Dream) There are occasional pangs of regret (e.g., shouldn't have thrown out the Keith Jarret.) Hard to decide on some I might listen to, but probably won't (12-tone Schoenberg?) But since there are still 4 or 5 thousand, more than I will ever listen to, and I still don't have enough space and need to divest more, I don't feel bad about the occuasional error. It makes no sense to keep everything. Can't find the title I'm looking for often enough, as it is.