There are no "DVC Employees" or "Hotel Employees." Costs are allocated based upon established formulas. I've been told the basis is registered guests. If the BoardWalk hosts 2 million DVC guests and 1 million hotel guests in a single year, generally speaking the DVC budgets will be charged for 66% of all resort operating costs: from front desk attendants to lifeguards to security guards.
Disney sells/rents villas to cash guests in a number of different ways. If Disney reclaims the room due to a member using an exchange program (
Disney Cruise,
Adventures by Disney), the original owner of the points is still paying dues on them. Disney is renting that room to a cash guest to recoup the cost of the exchange. If a room is made available to a cash guest because it was unbooked by a member, a portion of the revenue is credited back to dues under the heading of "breakage." If the room is a result of points that are owned by Disney/DVC, then Disney is essentially paying the dues.