Other companies (Marriott, Westin/Sheraton) do it all the time. If
DVC starts operating like those companies and enacting the same type of resale restrictions, they may as well copy the playbook all the way and allow "requalifying", "retro'ing", "point washing" or whatever else you want to call it...
It wouldn't necessarily be done in the form of a payment to bring in resale points because, as pointed out, buying direct would likely be cheaper. But it can be done in the form of "Buy a minimum of XXX direct points and you can bring in resale contracts of up to ZZZ points, and turn those resale points to completely unrestricted". This is a pretty costless thing for them to do - just change a code on a resale contract in the computer.
Doing this would only affect a small portion of buyers because most buyers are not aware of the resale option anyway. But with more informed buyers, they can (i) induce a buyer who might never otherwise buy direct to buy direct (ii) increase average contract size sold (eg "Buy a minimum of 500 points and bring in resale contracts of up to 500 points") (iii) get these buyers to buy multiple times, because the next time they buy a resale contract, they will be tempted to fully bring it into the system.