DayZ in current state is too buggy and it lacks most of promised features (it's in early alpha state). Once you get high tier gear and some food you can stop play, cause there is nothing else to do...
It will be fun game once it comes out as a finished product. For now it's too boring.
Oh, and BTW: FOnline is free to play and has only 1 admin who adds new stuff
DayZ cost around 25 euro and has whole team of developers...