As long as I have the room to store them, I see no reason to get rid of them. Same with fabric and everything else. I have a big house and lots of storage so I toss what I'm sure I won't use (cleaned out a whole cabinet of not so thrilling stuff while looking for a pattern) but I keep what I want. I can't tell you how many times I've been doing something and had just what I needed or had the information I needed because I didn't just toss things out because I'd had them a while. If you look at it and enjoy just having it, why get rid of it?