Mobile app devs NeuralNet has done an experiment which few devs can afford. They were able to release their Mortal Kombat Tactics game guide simultaneously on both Android and Windows Phone 7, and in their particular case found their Windows Phone 7 app performed much better.
Looking at the table of data below, it is clear their Windows Phone 7 app achieved much more revenue from Microsoft Pubcenter ads vs Google Admob ads.
Their ads also received many more impressions on the Windows Phone 7 than Android, possibly because there are less competing apps in Marketplace or on devices themselves.
|Android||Windows Phone 7|
|Day 1||1,866 Impressions / $0.57 Revenue||2,070 Impressions / $1.28 Revenue|
|Day 2||497 Impressions / $0.27 Revenue||1,903 Impressions / $2.52 Revenue|
|Day 3||521 Impressions / $0.05 Revenue||2,391 Impressions / $4.63 Revenue|
|Day 4||496 Impressions / $0.25 Revenue||3,693 Impressions / $3.86 Revenue|
|Day 5||304 Impressions / $0.13 Revenue||2,274 Impressions / $2.48 Revenue|
|Total||3,684 Impressions/ $1.27 in Revenue||12,331 Impressions and $14.77 in Revenue|
Whatever the reasons were however, it is clear the small size of the Windows Phone 7 installed base should not preclude developers from creating apps for the platform, at least if making money is part of the equation.