One man iOS dev here, not really by choice, I live in a mildly remote part of Alaska, which is not what I'd call a "technology hotbed" so finding co-devs is tough, unless you count my roommate who mostly just orders the pizzas. I'm not getting rich, but I'm allowed total creative freedom, and live simply so don't need to make much. Strange to think one can pull it off at all, but that's the internet for you.