Here's a basic assessment broken down using red and green to signify negatives and positives. Just my perspective and opinion on the domain.
Number of words: 2
Proper English: Yes
Number of characters: 11
Pronounceable: Yes
Currently Developed: No
Previously Developed: Yes (2000 to 2005 / 2007 to 2009) 2003 being it's Peek
BackLinks: 4
PageRank (PR): 1
Domain Age: 14.8 years
Alexa Rank: 10,792,388
Exact Global search for "Sports": 823,000
Exact Global search for "Forum": 1,220,000
Exact Global search for "Sports Forum": 1,900
Sports Demand: High
Sports topic(s) popularity: High
Niche sports overall competition: High
Target Audience: Anything sports related
Potential: Unlimited
With the above in mind, I would easily put a personal appraisal on this domain at mid. to high $x,xxx (reseller) - and - High $xx,xxx to low $xxx,xxx (End-User).
Please note that at the end of the day a domain is truly only worth what someone is willing to pay for it or what the seller is able to convince the buyer it's worth in their sales presentation. My appraisal is based solely on my personal opinion and should not be considered 100% accurate.