I say that you have to make up your own mind and be comfortable with your decision.
I never trade or sale from my personal collection...PERIOD! Hahaha!, but people contact me about trades for items that I have for sale almost every day. I always turn down trades, because nobody's sure if the deal was fair. I'd rather buy the CD, tape or whatever and not worry about somebody being resentful towards me over a trade that they agreed upon. We humans always tend to think that our possession or worth more than the other persons. Therefore, this is a common problem with trades. A trade always ends up feeling like it wasn't fair by somebody.
Do what you feel, because non of can honestly tell you what's fair or not for you.