And once you get started, the marginal cost is almost nothing but time if you can do the full thing. I am a hobby iOS developer, and it is the appearance that

And once you get started, the marginal cost is almost nothing but time if you can do the full thing. I am a hobby iOS developer, and it is the appearance that suffers the most on my low-end products. If you can do your own artwork then you can get by for about $0+your time.