I'm thinking of making one of my paid apps into a free app.
Though, the issue of angering people who paid for the app previously has come to my mind, since I want to put ads in the game, and have an IAP to remove them.
The only solution I can think of at the moment is to have the new version of the app save high scores to a different slot in the .ini, and check the .ini for old saved scores to unlock the IAP features.
Does this sound like a good solution, or does anyone have a better idea?