I'm not sure here but I'll give you my thoughts, it has limited usage being a .org and DVD copyright domain. It would fit best for pro copyrights site, but to the right end user. It could be worth some fair money, but you said you got a offer on it.
If you are going to make some money, to where you feel good about selling it. Then I would sell it, if you got a low ball offer. Then trying giving a counter offer, that fits more with wha you feel better about. It's only worth, what some one is willing to pay for it.
Worth by my guess reg price to low $x,xxx