There was a thread about this somewhere else . . . sounds like a scam to me. Personally, I wouldn't give out my address for $1.
Yeah, you'll get your dollar back and a shitload of jumkmail every week for however long you live at that address.
30%? Really?.... That seems really low. As for the original topic: I don't think it's worth a dollar for all the crap they'll send you. Sounds a lot like those offers where you get a free laptop if you buy 15 "gold" products, 25 "silver" products, and 35 "bronze" products to me. In other words: Crap.
What is the idea on the long run? Buy a game for $0.99 and get back $1? Who will finance this? And how exactly will they tell if an iTunes receipt is not faked?