While I also agree that the points system has questionable value, clearly there are many here who think it's great, so I guess for some there's great value. And there are ways to get good value, and perhaps that's what salespeople should focus on. For years they thrived on telling lies, or half truths at best, and sold to people who believed what they wanted to hear. But today's customer is savvier; they can attend a presentation and within half an hour have scoured the Internet to find out if things are true.
Instead of painting unrealistic pictures, they should focus on individual needs. For example, a young couple without children can benefit form studios at bargain rates, and can add to their ownership as their needs (and income) changes. Families needing larger accommodations can stretch their points with Sunday to Friday stays, or perhaps experience a different area in a hotel for the weekend for longer stays. Emphasize the cost savings of having kitchen facilities and grills; even breakfasts and bringing drinks to the pool saves hundreds. If you eat breakfast in and grill 2 nights of the week, a family of four offsets about half their MFs. Little kids- how nice to be able to have a separate room, a kitchen and laundry. The list goes on. Instead of playing the smoke and mirrors game, and hoping for gullible prey, they might actually be successful if they simplified their presentations to show how it can fit their needs, rather than creating the illusion they can go anywhere they want for a week in a 2 BR anytime they want to travel.
While personally I would have a hard time making a points purchase today, many of the same reasons we bought weeks when we did ring true today. The consensus generally was it's not an investment in the traditional sense of the word, but an investment in family, in the security of knowing that an annual trip was mostly paid for, the benefit of "since you have it you'll use it" and won't put off a vacation, etc.. The things that pull at heartstrings, rather than trying purely to make a case for dollars and cents savings, that's hard to justify alone with the points system.
I think the intangible advantages make a more cogent argument than trying to justify based on a purely mathematical (and illogical) cost analysis.