It's especially interesting to me, because my online game is far less successful financially. (I make a living at it, but it's not a glamorous one.)
To be honest, my gut reaction was initially "there's no way this game has 40k active users", but then I clicked the online tab and sure enough there were that many people listed in the last 24 hours. Colour me impressed.
Just to give you one datapoint: I played forumwarz episodes 1 and 2 pretty much like an addicted fiend when they initially came out. But I am not sure if I have been to the site in between and since (if you made an episode 3 in the interim, I don't know about it). If your TOS allows it, perhaps you could notify your users when new episodes come out? I'd personally enjoy episodes with a much longer story arc--I think that would keep your users more active and for longer--but I realize that is easier said than done.
Finally, I just want to let you know that I have always been pretty impressed by the online chat functionality that you implemented for the INICIT game.
To be honest, my gut reaction was initially "there's no way this game has 40k active users", but then I clicked the online tab and sure enough there were that many people listed in the last 24 hours. Colour me impressed.