This article compressed statistics collected that will be interesting to those who create and sell their iPhone applications in the AppStore.
The impact of cross-sales
After some time, sales of application A were launched for sale, application B, which contained a link to application A. As can be seen from the graph, sales of application A increased in cross-selling.

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A sourceThe effect of the free version on the sale of paid
After the launch of the free version of the sale of a paid increase.
A sourceThe influence of Apple banners on sales
PayBack - splash on the chart, about a month after the game was released.

Up There is a game that all sites have written about since the moment, but sales went only with the appearance of a banner from Apple - first the game was featured in the UK (a small splash), after a couple of weeks the featured banner appeared and in the USA a huge surge.

The game Theseus, sold for 2-3 copies a day, starting in September (the game was discussed in all popular forums), recently also received a banner from Apple - the result on the chart.
A sourceNumber of applications by category
A sourceValue and dynamics of applications for different mobile platforms

Value and dynamics of users of mobile platforms

Frequency of using applications on the iPhone and Android

The optimal length of the demos

Statistics on Jailbreak phones
A sourceAs you know, statistics is not a rewarding thing, but some preliminary estimates can be made based on the graphs provided.
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The book on the promotion of iPhone applications in the AppStore.Thanks for attention!