First off, are you sure you're really getting 1000+ uniques/mo?
Somehow only 85 registered members makes me think that the traffic is either not really coming or it's from a bad source (such as PTC sites, PTR sites, etc).
If that's all real unique typein and search engine traffic, then all the more to you... The domain could be worth near $200 with that much traffic... But if it's all from paid sources or isn't even real traffic, then the domain's not worth more than a few bucks above reg-fee (around $25 probably). Also, it looks as though members haven't been active for quite a while.
-Rick