The reality is there are very few people making six figures writing their own iphone apps. Even fewer that can sustain that level of income as a sole proprietorship for a couple of decades, which is what you will need to do to retire at fifty.

For every programmer who does create a sustainable business, fewer still get rich doing so. One reason, creating a wildly successful business is a completely different skill set from programming. Another reason, it takes a fair amount of luck for a company to become wildly successful.

Goog luck.