Paul Kim writes about indie Mac development in The Long and Winding Road:

"I’ve been doing Hazel for over seven years and I think it’s fairly safe to say that I’ve been successful doing it. I’m making more money than I did employed at other companies and I’m much happier with my job."

And

"One thing that I did learn is to have a healthy respect for randomness. Luck plays a huge role and you can’t always attribute one’s success or failure solely on their decisions and actions. … The point is that a good deal of your app’s success depends on luck. That doesn’t mean you sit back and just let fate decide; you still need to work to improve your chances. Just realize that there’s a big chunk you can’t control and that on some level, you need to be ok with that."

The longer I'm indie, the more I realize this is true