$1 per month until you stop paying the micro-subscription, and he's got about 4,000 subscribers at this point. If you're going to have recurring charges to let people play the newest version of your game and you run out of new content you either declare the game done (or unfinished as so many indie porn games have done) or you knuckle down and focus on new content. Or as bwazoo92 said, subcontract some work out to others so you can get the thing done. Oni's making 15-20K over the annual salary just from his Patreon, and if he was employed in the games industry he'd be fired for under-performing at this rate.