I was told, when I was trying to make a reservation using points, that the resort I wanted needed one of their owners to exchange their week for points to enable inventory (using points). This makes sense and why it's so hard to find availability using points for exchange. Not many owners do it.
Yes, I'm the one who's gotten TWO Hawaii exchanges, through points (Into Vacation Clubs). I had never heard that it "wasn't allowed", when you get your points through giving back your own resort. In fact I remember our agent telling us that it was one of the benifits. While it NAS BEEN a benifit, it is NOT one that is easily come by.