My experience was much the same. I used David's and the renter paid the full fee in advance, nonrefundable. I got 70% immediately with the balance on move in (about five weeks from now).
I have a Feb UY. I had bought a semi loaded contract only a month earlier. As a noobee, I didn't realize the risks of using a bunch of banked points to make a late Jan reservation. With my lack of knowledge, a private rental without a full payment would have put me in a big jam if the renter backed out at the last minute.
With David's it's all good! When I listed with them, I told them I'd list with someone else if they hadn't rented the points within 30 days. It took them two days to rent all my banked points (and a few borrowed) points in a single transaction.
This lowered my buy-in cost by $5 a point.