The App Store just turned three, and it never ceases to amaze us.

We all know how much of a commercial success it has been with how many apps have been downloaded. But from the new data Apple has disclosed about the App Store’s 15 billionth download milestone, we can draw some interesting conclusions…

1) More apps are being downloaded. In 2010, the average iOS user would download 51 apps. This year, the number of downloads has increased to 83- an impressive 61% growth. And as the number of iOS users increase, these figures are destined to grow even more.

2) More apps are being sold. In 2010, the number of paid apps dropped by 18%. But this year, it has increased by 14%. So, not only do people download more apps, but they are also willing to pay more for them.

3) The App Store overshadows the competition. There are 200,000 apps available in the Android Market. Apple, on the other hand, offers 425,000+. And don’t forget that not every app in the Android Market is compatible with every device. So the actual number of apps is radically inferior.

4) There are many, many free apps. If you don’t want to pay for your apps, then don’t worry- because you don’t have to. 82% of apps in the App Store are free, and the remaining 18% have an average price of $1.44. Not exactly expensive.

You might think that the App Store alone is enough reason for buying an iPhone, and you would be right. It works together with iOS devices to form the perfect ecosystem for your daily life. Don’t you agree?

[Fortune]