Ok, here is my opinion of making a profit throug playing online poker .
$$$ you win with onlinepoker are very likely to stay $$$ in the online-poker-realm.
You are a winning player (for this is true: we are all winning players at 2+2), you make $$$$, you move up, a) you lose, you move down, b) you make more $$$, eventuelly a little less in %, you work on your game, post at 2+2, have videolessons, and then after a lot more $$$ you move up. And so on. One week you have a really big downswing, you tilt, and most of your bankroll is gone. No problem for you as you are a winning player: you start building up a new bankroll.
Now read the chapter again and again, ... it shows your onlinepokercareer in the future.
Just my 2 cents.