Transferring points is a transaction between
DVC members. Both parties must be members (have a DVC account) in order to transfer points.
When a non-member rents points, he/she is actually renting a reservation/stay from the member. Points have no value to non-members. Only a member can make (or change) a reservation made through DVC.
Most members price the stay/reservation based on the number of points it cost the member to make. That is why you commonly see posts offering points for rent at $xx per point.
HTH.