Originally Posted by RBA
That's a reason why many APPs are free. They want that data to resell.
That and the ads. I don't mind ads being in apps. I run ads on my website. I know what they pay. It is something worth while and to be honest, if you have a successful app, you probably would rather have a free version with ads than a non-free version without them. In the long run, you will make more money that way (assuming the app is $1-2).