I want to know superb and proven technique about free 2 play type game.
Of course I have been played many of them and know how they design paid items and etc, but copying them is not enough for theory.
So I want to investigate and research seriously before deeply make my game's design document.
So eventual purpose of this strategy and research is to know,
[how to earn maximum money by F2P type game?]
[how to make user eager to buy paid item continuously? how to make them fanatic?]
Any useful comments or information site, articles?