Hi HN,<p>My first iPhone app has been on sale since less than a week, and I've observed huge (and seemingly inexplicable) variability in its ranking on the AppStore.<p>See for example this chart (thanks to appfigures.com) of its ranking in the Navigation category of the French AppStore:<p>http://i.imgur.com/YRktW.png<p>One thing I do not understand is the wide swings and sudden drops. Are there any experienced iPhone developers/marketers here who could shed some light on these strange artifacts?<p>Thanks!