Someone should make a mod or atleast have the developers input this idea, You can make a long running game, where it lasts on the market for a long time, and on top of that you can update it like for instance, Cod adds these DLC Packs and all. And you can earn money from adding DLC Packs, depending on how good it is. The Long Running Game option would probably have to last atleast a year or 6 months.
EDIT: Nvm I’m an idiot I figured out theres an MMO option, but the update your game idea still stands.