DVC members pay an annual Maintenance Fee (MF) on the points they own.So, your points is your maintenance fee? Or points needed and maintenance fee are separate fee's?
To book a room, DVC members don't pay cash, they pay points.
Ignoring the purchase price, the cost of a room then becomes MF times points.
As an example, it costs 10 points to stay at a Boardwalk Villas (BWV) Standard View Studio during a week night in September. (This basically is a hotel room with a view of the parking lot.) In 2013, the MF for BWV was $5.84/point. So, ignoring purchase price, it costs a DVC member who owns at BWV $58.40/night for that room in September.
All DVC points are assigned to a specific DVC resort (called the Home Resort) and DVC members who own there can book 11 months before arrival. DVC members who don't own at a resort can book 7 months before arrival. The extra 4 months is important because DVC resorts are close to 100% full and some rooms are much more popular than others.
For example, if you want to book at BWV or Beach Club Villas (BCV) during Food & Wine Festival, you pretty much have to own at those resorts. By the time the 7-month window rolls around, the rooms at these DVCs are mostly booked. DVC members who don't own there might be able to get 2-3 nights midweek but getting a full week or weekend is hard.
Note that each resort has unique MFs and point requirements. For example, BWV is $5.84/point and 10 points/night for a Studio in September while BCV is $5.65/point and 15 points/night for a similar room.
The points needed to stay on a particular night rarely changes from year-to-year. The total points for the entire year must remain constant but points on specific days change slightly, most noticeably to take into account the moving Easter holiday. Sometimes, there are special cases when Disney needs to reclassify rooms and points change but, again, the total points for the entire year must remain constant.
What does change every year is the MF. Historically, this has increased by 2-to-5% annually.