How much would this be worth?, its a PR2 domain, a lot of backlinks, gets around 100~ unique hits daily, and also comes with this custom PHPBB3 skin. Most hits come from gaming websites, so if developed could get a lot of targetted traffic.
It is worth a little due to the traffic. The domain by itself imho is not worth a lot as it is a .net you will lose a chunk of traffic to the .com I would suggest that you develop this into a niche site. Research where the traffic is coming from & what kind of gaming sites and create something that will help retain some of this traffic into returns. You would make more $$$ doing this than just selling to someone . If I had to venture a guess and you are getting 100 unique visitors a day , to the right person you could probably get high xx for it.
I would develop it and then sell it. Right now you might get low to mid $xx. BUt if you develop it and sell a site with it could easily be low $x,xxx.