Quality & Price across iOS and Android
I own both an iPod touch and a phone running android, there are two things that some of you have already mentioned about the possible reasons for the poor sales:
1) I've found identical apps from the same developer to be very overpriced on the android market compared to iOS, also EA/PopCap haven't released many games for the android system which I would prefer to see bigger developers porting their apps to android, not a crap "cant be bothered" quality style app coming across.
2) The apps in general are - generally - much poorer quality, not sure what it is, but even stupid time wasting apps on the iOS are made to a much higher standard than any on the android marketplace.
Oh and don't forget the chinese/japanese apps that flood the "Just in" section of the marketplace of the same app with a *slightly* different design.