MAYBE. Its still your name on the contract with
DVC, not David's, so if the charges don't go through or the room is damaged, you are still on the hook
David does demand payment in full at the time of the reservation - you get half up front and half when the reservation is completed - so that helps on the getting stiffed issue.
And David keeps the time wasters to a minimum. You don't get a bunch of shoppers through David, and he does the first check on availability, so you aren't chasing a BWV standard view at five months out for someone.
But the math really doesn't work out that well for the bother. You put $75 into points and pay $5 in dues. So getting $11 a point you are only making $6 in profit, it will take you 13 years to pay off your original investment - ignoring time value of money and the income taxes you are supposed to pay on the rental - both of which hit you on the profit side.