What I would like to see, are skills and perks that will go toward grinding plastic. You should also implement an event system to allow a little sugar coat to make people happy, like, a pirate raid on this group, or a boost in plastic income to this group.
You should also make grinding more difficult than doing mousefire(1); and make the pickaxe/what ever your faction uses to get plastic break sometimes, have the possibility of a tree falling on your, a cave in, or what ever the other faction does IDK.