The iTunes App Store is huge. 300,000 apps huge. I've watched this monster start from nothing and turn into a billion-dollar industry in only a few short years. We've been approaching this point for some time now, but it's more apparent than ever that app exposure is of critical importance. A healthy majority of iOS app users discover new applications directly from their device as opposed to using iTunes. If you look specifically at the iPhone, the amount of real estate for discovery is only available to a very small percentage of the total apps. There are currently 20 overall categories, with Games offering an additional 20 subcategories. Each subcategory is broken into three lists and displays a max of 100 apps on the iPhone. Throw in a small number from the Top 25 and Featured lists and you wind up with roughly 12,000 apps being shown at one time. This works out to only about 4% of all apps that receive visibility. One can browse beyond this number on iTunes, but that quickly becomes an overwhelming, laborious task. 
Source: http://feedproxy.google.com/~r/Techcrunch/~3/mj-xteFLVag/
