The author's point was that your game/business should not rely on tricking the user out of their money. The user should be well aware of how much money he/she i

The author's point was that your game/business should not rely on tricking the user out of their money. The user should be well aware of how much money he/she is spending and the app should be awesome enough that the user feels "it's worth it!" This is better for the market because its not a competition for who's the best trickster, but who can make the best apps on which people WANT to spend money.