I found out after her wedding that my friend only registered so she could return all the gifts later and have cash because she didn't really need anything. My instinct is to think that is rude... maybe it's fine if nobody finds out, but for me I was annoyed that I paid for shipping on a gift when I would have been happy to give her cash to begin with. And I guess a little bit that she didn't actually want what I picked out for her, and I thought she would because it was on her registry. If she was comfortable enough to tell me after the fact, why didn't she just tell me before!
What do you all think of that idea? I suppose it's a sneaky way to get cash when you don't want gifts... you know without being tacky and asking for cash. :-P