Here's an interesting survey by Digital Book World on the Annual Writing Income by Author Type:
|from the People Who Write Blog|
I find this interesting not because it shows how most authors don't make even a thousand bucks a year (that's not really a surprise), but because it suggests that going for a hybrid of self-publishing and traditional publishing seems to be the most lucrative approach to writing. I thought traditional publishing was still the best bet in regard to the amount of money earned. But it seems mixing it up literally pays off.
Just some food for thought.