You might consider those pirated copies as advertising for your app, not lost sales. I doubt that the people who pirated your app (as others mentioned, these are probably kids who can't buy apps for one reason or another) would have bought anything from you otherwise. You haven't exactly lost sales, you've gained a large group of testers who will probably tell other people about your application. Yeah, it would be nice if all of them bought a copy, but they wouldn't know to tell other people (people with money) about your product if they hadn't pirated it. So, there's two ways to look at it. You can certainly take the RIAA stance that piracy is bad for you as a developer. I'm just not convinced that that's true.