If you don't use it, sell it. That's my philosophy. Unfortunately, my philosophy has also cost me a couple knives that I really love and with I still had...come back BWM and DSF!!!!!!!!

Seriously though, if it's one I know I won't use, I can't hold them. But that's just me. Only one's I regret are ones I sold only becuase I needed the cash. Never regretted one I sold because it was destined to be a safe queen.