They're all learnable skills. But I guess my point is if it's taking 95% of the effort, it's probably the wrong path. But when you've already put the effort into that one game, it's hard to see yourself marketing a different game.

There's a good video on designing games to be sold. The base idea is to treat it like a search algorithm. You can be an amazing fisherman but you can't catch many fish where there's no fish. https://youtube.com/watch?v=o5K0uqhxgsE