According to Chris Fergueson, you can expect to win around 2/3 of your one table sng and around 1/8 of MTT tournaments. I have only played about 100 of the (9) sngs and have made ITM about 90% of the time. I find that if you play 3 games get 1- 1st, 1-3rd, and 1-4+(a loss) then you end up making the amount of the buy- in as profit. A $1 sng pays on average $1 if you play 5 of them you make $5.
Can you live on $5 sngs? Can you achieve the 2/3 win ratio and the 1/3 1st place ratio? Can you still achieve this if you multi-table? Can you still achieve this if you play turbo?
A regular one table sng on FT takes about an hour a turbo take about 1/2 hour.
I think you need at least $100 a day to survive!
So how are you going to get the 20 games in a day:
4 at a time for 5 hours (2.5 for turbo)
2 at a time for 10 hours (5 for turbo)
THESE ARE NOT LOFTY GOALS IT CAN BE DONE IF YOU ARE SERIOUS!
As far as ROI is concerned if you have less than 10% you may need to think about skilling up, leveling down, decreasing the number played simultaneously, or stop playing turbos (my ROI is over 200% look it up if you feel you need to)!!!