It doesn't always work. They suspended that policy (at least at my area stores) for several months a few years ago. I don't know for sure if they ever reinstated it, since I haven't had a registry since then. They don't have to give you any notice if they suspend it, and you'd be stuck with store credit. They can also see when and where the items were bought, so if they ever decide to take a look and notice they were all bought by at the same time and place, it could be very bad for you.