I have to agree. I have published 12 apps on Windows Phone and ported 2 to Android and 1 to iOS, and my experience has been exactly that. There is less competition for small developers. My apps are not earth shattering or new in any way, I was just learning how to code and thought it would be cool to try and earn a few extra dollars doing it. The one app I have that is available on all three platforms did substantially better on Windows Phone. In numbers, I got about 1500 to 2000 ad impressions a day for 6-7 months on wp7 which has settled down to about 500 a day after 1.2 years. Android has been consistent at around 1000 a day for 4 months, however the pay out from ad mob vs microsoft pubcenter has been dramatically less. As for iOS, it hit about 2000 impressions the first day and has dive bombed since then. Now steady at about 300 a day. Interestingly it pays the most and the clicks on the ads are massively higher than Android. Like 50 clicks per 300 impressions. I think on iOS the user as so many more options, why would they open my app? If I was a large shop, I would take that into consideration. For reference, the app is called Critter Cards- Toddler if anyone is interested.