one of the DVC perks is to trade out - cruises, WDW resorts, concierge collection, adventures, etc
these options must be paid for. So DVC gives the points, which have been turned into reservations at one or more DVC resort, to Disney for renting.
the points have been used by DVC members - so the rooms or villas are gone and DVC members can not get them for points only cash.
to get a villa thru Disney look for them from 9 to 6 months - the sooner the better. BLT and BCV go fast. if you just want a villa then OKW and SSR are generally less expensive than the other DVC resorts for renting with cash.