Single Biggest Mistake When Starting An App Business.

One of the questions I want to respond that many Appreneurs as is regarding the biggest single mistake that every developer or App entrepreneur make when they start a new venture or  a new app. One of them is that they focus on the monetization and how to make money fast and not in the product itself.  It is amazing that they get into the app world because they saw another case probably on TV.  There are cheap news channels where they just put a interview with random people and talk about how they make millions of dollars in one single game.