Or you’d need to write 3 official games in a year.
Technically Cataphrak. He’s paying his way through college by writing his games.
I think Zachary Sergi mentioned in Author Hangout on Air - #3 by jasonstevanhill that it’s his main source of income. (Not his only though and I could be mis-remembering.)
But you’ve to remember that most authors, when starting out, also hold down full time jobs while writing.