If you really want to save some BIG bucks then rescind your point purchase, forget about a resale point purchase, and purchase a resale week instead.
The most bang for the buck are resale weeks! Granted you don't have the flexibility of points, but resale weeks are a bargain these days!
Right now, on eBay, there are TWO Marriott PLATINUM Oceana Palms resales up for bid. This is a FIRST CLASS resort, and these weeks can be used for occupancy or Interval International trading. Current bids are currently $338. I think these originally sold for over $30,000 per week.
Now there is no telling where the final bid will be, but imagine paying just 1% of the original retail price..... This is why I really believe that resale weeks are the best way to go, but others do have differing opinions.
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Holy smokes... this world of timeshare, resale, and opportunities is endless. Thanks, TimeTraveler for the idea and insight!