After reading a tweet by David Barnard about the wild variability of sales in the app store, I was curious to see how my sales have varied this year. Below are the percent changes day-to-day and week-to-week for the year to date.
As you can see, daily swings in the 40% range and weekly swings in the 20% range are not uncommon.
If you make your living in the App Store, a strong constitution and a bit of patience is essential. Enjoy the ride.