There are different departments within Wyndham with sometimes competing interests.Neither is good to be sure. If I ran a business, I would want my sales at the max capacity I can handle and in WorldMark's case, every unused night means one less customer to try and sell them something. This is not utilizing WorldMark's assets to their fullest potential - which I would think would be a goal of management.
Only 1 of the five resorts I frequent has a sales presence. When I arrive at the one with a parking pass desk, I tell them I have been to dozens of updates over the years and am a terrible sales prospect. It does not phase them, because they are the marketing department and their job is only to sign me up, not sell me anything.
The two-night minimum is the operations department dealing with a labor shortage. How it might affect sales is none of their concern. Plus, owners booking the one-nighters would use one of the cash options to avoid a housekeeping charge. If they can get the reservations they need with cash plus the credits they already own, why would they buy more? Additionally, checking-in at 4 p.m. and checking-out at 10 a.m. the next morning leaves no time for an update. The two-night minimum likely has little to no effect on sales.