I agree with what other have already said. The main challenge is the noise in the store… way too many crappy apps that still take up space. However, you need t

I agree with what other have already said. The main challenge is the noise in the store… way too many crappy apps that still take up space. However, you need to define "win". Just like in any other business if you want to make millions you need to put in big cash (just look at real estate). If you win by having a revenue that allows you a comfortable life, it's still doable. I've been an independent developer for 4+ years and have been living on it since. I make mostly passive revenue with my apps and play tennis 2-3 times a week during the day. I certainly will not complain.