Don't let anyone ever tell you that your opinion isn't worth anything. In fact, your thoughts are so valuable that Google is willing to pay you for them. Well, there are two caveats - you must live in the US, and you have to be fine with being paid in Google Play credit. But hey, when it comes to Android, that stuff is as good as cash.
Users can spend Google Play credit on digital content in the Play Store, including apps, games, music, books, magazines, and videos.