Mobile advertising company Mobclix has released a study comparing the revenue generated from ad-supported free apps on both the iOS and Android platforms, and found that advertising on iOS was significantly more effective -- sometimes yielding more than double the revenue -- than on Android devices, making iDevice users more "valuable" to developers and advertisers. Although the study focused on popular apps with more than 500,000 downloads and/or two weeks spent in the top 10 downloads), the overall trend shows that "free" apps can often be just as profitable per u
