I read an article on Wired Magazine written by Owen Faraday that dealt with strategic board games and why there were fewer board games from Android then for iProducts. He was focused mainly on games like Pauerto Rico, Settlers of Catan, Ticket to Ride, Phantom Leader and the like.
Granted this is a niche market but it might be something that appears across other app submarkets.
After intreviewing developers and programmers, Owen finds that there are many more games available for Apple products because it is easier to code for one IOS, there are fewer forks to worry about, and IProduct users are more willing to pay $5 or more for an app. Even as the Apple market share shrinks, the Apple app market is more profitable and will receive more attention then the Android market.
I cannot access the article at work, hence the details in case anyone wants to look it up. The article lead to discussion at boardgamegeeks and Pockettactics where a fair number of developers chimed in that they agreed with the aticles premise.