The answer in part is that is affordable to push a mediocre app to the top of the free charts via advertising and make money, but it is not possible to push a m

The answer in part is that is affordable to push a mediocre app to the top of the free charts via advertising and make money, but it is not possible to push a mediocre app to the top of the paid charts and make money. Note that the actual quality of the top paid apps is much higher than that of the top free apps for this reason.