Oh no I didn't say that but I've never read a book I've not wanted to keep, I might change my mind on it 
I'm guessing you've never had to MOVE, have you?

Moving all your crap across country really forces you to reevaluate what you should actually hang on to. If it's been sitting in the attic or basement for more than ten years, you aren't ever going to look at it again, in reality. I can't tell you how many comics I got rid of when we moved. I don't miss them.
I know what you mean, though. I get attached to certain books and I'd never part with them. However just looking through my collection I found a couple of dozen I knew I'd never read again, it was easy to list those. Might as well give someone else a chance to enjoy them.