For every rags-to-riches story in Apple's App Store, every amazing tale of Joe Coder in his basement turning a dead-simple idea into a few thousand dollars a day, there are well, zero in the Android Market. At least, that's the impression we're getting by digging into revenue stats published this week by mobile game house Larva Labs, lamenting the stark disparity in the economics between the two mobile distribution platforms. Despite having two apps prominently featured on the Market's home screen and racking up sales rankings of 5 and 12 overall, Larva Labs' $4.99 RetroDefense and Battle for Mars games are grossing between about $30 and $110