Admittedly slim, but much slimmer if you spend 40 hours a week working for someone. :)
Mobile got super saturated quick. I tried the same thing and was only moderately successful. I still work for someone but fight for my own thing when I can.
Being one of the relatively few people who knew about developing mobile applications in 2008, I tried to do something “on the side” with a coworker. Another much better funded company was able to move faster than we could even though you could tell from their product that they didn’t know the industry they were chasing.
The only way we could have been competitive (not necessarily successfully) was by being able to dedicate to it full time and networking and selling during normal business hours. So yeah, a small independent developer who has to work full time is ata major disadvantage.