The devs might just get bored easily. I know that feeling, just not as a game creator. It's kinda simple to start any kind of project, get the broad-strokes stuff sorta going, and then drop it because working on it isn't fun any more.
I imagine it's a little like playing an RPG with a bunch of different character classes. You start as a fighter, play a few chapters, then get bored and try a mage, then get bored and try a bard, monk, animal husband, thief, etc. You never end up getting beyond chapter 2 (and, incidentally, start to get tired of the entire game after playing the first chapter nine times with only small, non-plot variations). I guess it's the novel parts of learning the basics for each class that's interesting, and the actual playing of the game using those mechanics is less so.
For game creation, figuring out the basics of getting the characters designed, combat or other gameplay worked out, and a playable area or two made is the part you would be doing over and over again; the boring part would be actually making the maps, dialog, enemy patterns, and whatever for the rest of the game. You end up with a bunch of stuff started and maybe even mostly designed, but never get excited enough to actually finish anything before some other project sounds more fun to pursue.
Of course, as long as the patrons keep getting content, they might be happy with an arrangement like this.
