Admob Publisher Survey
A very 
recent Admob publisher survey shows some interesting trends…
However, as the survey was from Admob, we might expect that their publishers might represent a greater proportion of those making money via advertising. Likewise, it could be said that Android and iPhone, where there are more applications, much lower prices and more competition between apps, might encourage the ad funded model. BlackBerry, Symbian and Windows Mobile apps tend to be sold for higher prices and might not need in app-advertising and hence be less represented on Admob. As with all these surveys, you also have to look at where they are coming from and compare with data from other sources.
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