I almost never buy Android apps. Correct me if I'm wrong, but the Play store doesn't have gift cards like the iTunes store has. That's why I buy Apps on my iPod

I almost never buy Android apps. Correct me if I'm wrong, but the Play store doesn't have gift cards like the iTunes store has. That's why I buy Apps on my iPod, because I don't need to put a credit card on the account, I can just go to the nearest 7-11 and purchase a gift card. Putting ads on the app is defiantly not a good idea. Maybe create a free version with some of the features lacking. Or, just try to advertise your app more, and maybe you'll get lucky.