I spent 6 month developing a game in my spare time:

https://itunes.apple.com/us/app/polar-turtles/id892249118?ls...

3 weeks after the launch the game sold 6 copies and made 8,95$. I sent out 51 promo codes to various review sites but only 8 of them got redeemed.

I can already guess how impossible it is to enter the iOS gaming market.