When I write software I try to think with the mentality of a user as much as possible. And my conclusion is that most users don't even see app functionality, th

When I write software I try to think with the mentality of a user as much as possible. And my conclusion is that most users don't even see app functionality, they just see the goal in their mind. People use Excel to get calculations, not to put things in cells. People play game to have fun, hence the rise of casual gaming. I've never put advertising in my apps because that seems to me that when the user clicks the advertisement it will take them out of the app and away from their goal.