In order to make sure that in-app purchase prompts are thoughtfully incorporated into the user experience without being obtrusive, developers should also carefully consider thsatta kingue timing & placement of these prompts. Developers can potentially increase revenue by increasing the likelihood of users making a purchase and streamlining the purchasing process, all while providing value through in-app purchases. Advertisement Income: A Profitable Option. Ad revenue is another successful method of making money off of game apps.