I use my iPad to play games as a form of relaxation. Nearly all the games I play are puzzle apps with levels that can be played in a few minutes. Nearly all of them are free to install. So how do they make money? Now I would be the last person you should consult about marketing but it has always seemed to me that the best way to market your product is to convince people that it offers something they want so that they are prepared to pay for it. This is not the currently favored approach for m...