Found very interesting the reading of Goodsol post about how he did a one-week game (Freecel) and he managed to make more than 50.000$ in 9 years. That’s about 5000$ per year and isn’t bad for a game done in 1 week.
However, as the ultra-pessimistic princec pointed out (but in this case he’s right), he is an exception to the rule. No game done nowadays in 1 week can hope to get even close to 1000$/year. Otherwise, anyone would be doing it and everybody would be happy, no? 🙂