Probably not worth a lot to be honest.
As Fragma stated, Not worth a lot, Probably.
Yeah, unless the first forum was related to the American Civil War, there's not much foreseeable growth. Otherwise, the domains stray too far from the original domains.
FourChan will be worth a lot if you are targeting the right person, but most people will call you a jerk for trying to rip it off.
Some of those domains are quite unique, as explained above by Xypher fourchan would be worth the most out of those lot.
The first two would probably be the most useful. They could be used for either Civil war discussion forums, or you could start a clan for a war game and call yourselves the Confederates.
Fourchan.info could become very popular, same with rickrolls, depending what you put on them.
If you are looking to start a forum, the first 2 are the way to go.