The idea gets mentioned here every now and then. It has not happened.
Once, I called Give the kids the World and offered a weekend to a volunteer. I have March UY, and a volunteer family got a weekend at OKW. That's what I did.
They would also have to follow the transfer rules for such a gift which means they'd could not be banked/borrowed and it would use your one transfer for the UY.
Those points end up as breakage. Proceeds (up to 2.5% of the operating budget) less a "commission" to DRC come back to DVC to reduce Members' Dues. Proceeds over the 2.5% go to Disney.