Right now the game is only $10. As for the community part, I am not sure, there is a presence here and in game usually there a lot of people. There are weekly livestreams for this game [along with the other games Trions invloved with] [Fridays at
Twitch.tv/Trionworlds] that are put on by the devs/cms but there are some changes going on with that at the moment. The game is [seems] like it is on a steady path, They are just about to release their 4th DLC next month [This won't exclude you from the game if you don't buy it as there will be free things that come out as a update for everyone usually when DLCs launch]. The secons season of the TV show is gearing up to start so we wil start seeing more content [what that specifically is they haven't announced].
All in all I think it is worth it.
If you are still a bit iffy, there is a
PC Trial to test the waters and see if it is something you'll enjoy.