How do you price them? (Yes I know the shorter the name and the closer to the niche you get the name as well as .com is better)

My question is if I had a .com sitting around for a year and didn't want it any more (no time to put into it) - how would I go about selling it for the right market price... What is the right market price?

I know a few will say the registration cost is the market price but that would be if you got the name first.