I'm actually more curious about how 'non-blockbuster' apps do in the store revenue-wise than the well-known super-success stories (i.e. if it's a worthwhile pursuit even if Apple doesn't find/promote you).
For non-blockbuster, non-featured, non-top-100 apps, the word going around is that if you get an app in the top 20% but not in the top 10%, you will currently make in a very wide neighborhood of $10 a day for that 1 app (seems small, but that adds up to over 3 grand per year if the app keeps selling).
Above the top 10% level, an app starts bringing in exponentially more than $10, all the way to blockbuster millions. Below the top 20% an app quickly trails off to few to none downloads per day. I doubt that the average (median or 50th percentile) app sells at all on any given day. So if you aren't planning on creating and marketing a clearly above average app, don't bother.
*** Note to iOS Developers: I have some regression curves plotted for estimating sales vs. popularity, but they need more current data points in more categories. Private message me, and we can exchange confidential data points for curve plots.
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