I've never thrown any of mine away. When they're really old and ratty looking and not presentable to wear to town, they're just perfect for old, soft, bedroom slippers. Another pair of "oldies but goodies" I use to wear when it's raining or I'm working in the yard.

I'd have a hell of a time trying to decide: should I? or shouldn't I?

Sorry, kat, I guess I'm not much help.