LOL, you must have missed that it has 55k backlinks = (probably a ton of traffic)
I'd guess
mid x,xxx to an enduser just because of traffic and PR.
high xxx low xxxx to a reseller.
There are lots of endusers looking for domain names with traffic however, so I'd sell to one of them instead of a reseller.
55,000 backlinks and only pr4? I had a pr4 site that didnt even have 1,000 inbound links