After making a free app like my M2 Sony Camera Remote app sometimes as a developer even though it's free. It'd be nice if there was some avenue for getting paid by our users if they so wish to show their appreciation.
Some of you might say that a good way is to use In App Ads, but I really hate the ad systems that are out there which most people use especially on games that my son plays on the phone or iPod touch. Frequently you see many inappropriate, non family friendly ads.
So, to that end, I resort to using the In App Purchasing system offered to me by the Windows Store. And here's the presentation and sample code which I did on Malaysia's //Publish/ day event.
Check it out here.