If I were Apple, I'd be kind of embarrassed that my organic ranking system could be gamed this easily. I mean, there's a huge cottage industry (with its own jargon and professionals) built around figuring out the exact wizardry needed to get your web page highly ranked, yet on the AppStore, apparently the only thing that drives their ranking is "number of downloads".
I wonder if the result of all of these "discovery" apps will be a more complicated ranking system from Apple that takes into account more than just downloads...