While DayZ is currently very popular and has an extensive following on SimHQ, that is not why we opened a sub-forum for it.
The reason a sub-forum was opened is, it is based on Arma 2, a game we already strongly support, and have a dedicated forum and download area. The Arma 2 forum has several posts on DayZ, and we need to keep the two worlds apart for discussions -- but we don't want to chase the discussion of DayZ out of the forums for those of you who enjoy it.
We recently were asked to create an RPG forum, and it was declined, because that is not SimHQ's area of focus. Neither is DayZ, but arguably, had Skyrim been built on an already supported simulation title such as DayZ is, it would have been considered.
Why isn't Iron Front: Liberation 1944 a sub-forum of our Arma 2 forum? Because it fits more with the SimHQ charter of simulations.
As long as DayZ is a popular title based on Arma 2 technology, we will offer a sub-forum for it.
If this makes sense, great. If it doesn't, you can yell at me.