I would be interesting to see comparison from a well-known game developer focusing more on up front purchase price. Don't get me wrong, I think it's awesome that Spacetime Studios is so profitable on Android, but I would like to see how it compares for paid apps, especially since there seems to be an impression that Android users don't pay for apps (at least not up front).

Regarding the comments in the article about ad click-through, my personal hypothesis is that iOS users are more used to paying for apps up front, and ad financed apps are not the norm, therefore people filter out the ads in their brains. On Android it seems to be the other way around.