Every year, there will be more resorts and way more exchanges. Sometimes, there are un-used weeks due to low season where people are not travelling. This also give you the ability to do short getaways. Exchange Companies like RCI and Interval International are doing this. They come at a very cheap price.
They believe selling the room cheap is good. With people at the resort, they will have revenue from restaurants, bars, tours and other services provided at the resort. This give you a great chance to get away at a good price.