If you are considering going into developing apps to make money then you might want to think again. It has been said that about 99% of developers are not making any money on their apps.
Only 1% of developers are said to make serious money from their apps. This may be down to the fact that many of the apps entering the app store are just copies of other games. For instance Flappy Birds has been very popular and this game did make the developer money. Therefore we have seen copies of the game come out.
Google says that they have the biggest app store but bear in mind that they are talking about quantity and not quality.
So if you are entering into app development you are going to have to come up with an app that is new and exciting and not just a copy of another developer’s app.