Couple important caveats with the provided graphs:
The graphs are rankings not revenue (understandably he doesn't want to share). But this introduces the problem that a week in the top 10 and a week at #500 does not equal to two weeks at #250. Not even close.
Further 250th place today =/= 250th place in 2009 or 250th place in 2016 or 2030.
Ron Nicholson [1] roughly fits the following formula for app store sales:
The graphs are rankings not revenue (understandably he doesn't want to share). But this introduces the problem that a week in the top 10 and a week at #500 does not equal to two weeks at #250. Not even close.
Further 250th place today =/= 250th place in 2009 or 250th place in 2016 or 2030.
Ron Nicholson [1] roughly fits the following formula for app store sales:
unitSales = totalPaidApps * ((1 + rank) ^ -1.0) - 1.5
This suggests that a week at #5-10 is worth about 23-42 weeks at #250.
[1] http://www.musingpaw.com/2011/04/estimating-iphone-app-store...