Fiksu says that the uptick in downloaded apps was expected as each launch of a new iPhone brings a number of first-time Apple iPhone users looking to explore the App Store. Add the number of iPhones that were updated to iOS 5 and you have a strong demand for users to add new apps on their device. Fiksu added that it expects the numbers to rise for this month thanks to a record setting Christmas Day that saw 6.8 million activations of iOS and Android devices combined.
The volume of daily downloads of the Top 200 free apps in the App Store rose to a record in November
Another index created by Fiksu, called the Cost per Loyal User Index tracks the cost required for a developer to obtain a loyal user for a particular app. A loyal user is defined as someone who opens an app at least three times. In the last few months, developers have been spending their marketing dollars wisely as the index has dropped from a peak of $1.64 in September to $1.47 in October and $1.43 in November. To define it, developers spent an average $1.43 per app for each loyal user.
source: Fiksu via AppleInsider