I was recently on a server that had gangs.... Gangs is basically a "faction" and you have a prefix in front of your name with the gang name. This is a fun thing, because its awesome to work together and have fun. You could also incorporate coin trading in gangs. This is my suggestion, let me know what you guys think.
I like your idea , @Ditteamalie there will be teamers with Or without the " Gang " thing , so i think it will be exciting +1