Firstly the enquiry is genuine and not a scam.
The name is two generic words which apply directly to my industry but could also to others, I also own the example-example.com as well, it is 13 years old very well-established, well-linked and #1 widget trade portal on the Net. It has thousands of pages with thousands of #1 ranking pages.
GD have asked me if it may be for sale and to either tell them the price or alternatively they will make an offer on behalf of their client.
I assume they are using GD in the hope that they may negotiate a better deal since the ownership details are not hidden.
Realistically I've never even considered this as a "valuable" name with it being generic but at the same time this site generates me many tens of thousands of AdSense revenue a year.
Could I easily move it to another domain name...no problem, getting all the backlinks updated is another matter altogether therefore how do I value this piece of property?
Do I wait until I see their offer and then most probably say, don't be silly, 13 years work at $20k p.a. makes $1/4 mil. to me!
Honestly, I've never sold a name that has such a well-established site on it, any pointers from anyone who has?