Dont listen to him, you can sell the domain! I mean think about it people sell names like halo4forums.com and farcry3forums.com EVERYDAY for thousands! I dont know a good appraisal, but yes you CAN sell it!
Yes you can sell it, but If the company who made grand theft auto wanted to be hard @$$es they could pursue legal action for you even registering the name. Bottom line... You cant register Domains with a trademarked name in them.
lol err ok, i doubt they would take legal action, many people have sold it, and it also contains forum so it doesnt do any harm.