I agree it is a time in this could become useful.
So you can set one up for under 50 bucks now which is a pretty doable price range. It might be worth setting one up and running it just for the experience. But the things I think could be useful to add on is some kind of basic forums or BBS system might be nice where you could leave a message. And if it could have it do some kind of mesh networking similar to how the Byzantium projecthttp://wiki.hacdc.org/index.php/Byzantium
is supposed to work.