I got the game when it dropped, hoped for a good follow-up to L4d since it was Turtle Rock who dropped it, sadly 2k never gave it the real support it needed, but recently they turned the servers back on and there's been a bit of a revival. If it does get the interest it may be reactivated on Steam, but currently, you can't add it from there to your library, you have to purchase it externally. I agree, maybe if it was like 20 bucks at most. But as for the rest, it's entertaining, and if supported more and a bit more fine-tuning, it really could take off, but that's me just being optimistic.