Comment Re:Numbers need a reference scale (Score 1) 510
They probably have some part of their game that connects to a server to post scores, or some code that phones home. But most likely its a score posting and during that connection they get a unique ID for that phone so you can over write your best score. But if 8,659 people send in scores, but only 2,831 purchases were made, they can determine that most likely there is a 67% piracy rate for their application. So, its a guess, but a very educated guess, and could actually be said to be the lowest their app is being pirated, in that it could be higher amount of people having it installed but are not phoning home.
This is why we need more transparency in the numbers. The numbers scenario you describe could actually occur with no piracy at all. The Android Marketplace has a feature where you can buy an app and try it out for 24 hours and then return it for a full refund if you don't want it. Conceivably, 8,659 people could have bought the app and then played it for a day, but only 2,831 people ended up keeping it, meaning the developer only sees 2,831 purchases, but also sees 8,659 different score submissions to the server.