Actually, you would buy the number of points you need for your vacation needs and purchase that number of points at a "home resort" which simply means you have an advantage of booking 11 months in advance during busy seasons, in other words you can stay at "any" DVC resort, but, can only book 11 months in advance at your "home resorts". If you wish to stay at any other DVC resort you must wait until the 7 month window before your vacation takes place to book there. Example........you decided you will need a 1 bdrm villa for most vacations, your usual vacation takes place in the month of January, which is considered Adventure Season for DVC purposes, so go to the
Point Chart and you will see VWL 1 bdrm in Jan requires 200 pts for a week, SSR requires 182, and OKW requires 160. You've purchased 200 pts at VWL because you know that's mostly where you want to vacation and most vacations happen in January. You can book at VWL 11 months before your scheduled vacation, but, you must wait to book at SSR or OKW until 7 months before your vacation.
To answer your question about point cost.....if you pay $90 per point and purchase 200 points your upfront cost would be $18,000.00. Then you would need to pay yearly dues at VWL (your home resort) of $4.87 per point, which is the amount set for 2008 (this can fluctuate from year to year depending on estimated costs for the year). For the above price, you get prepaid vacations until the year 2042 at VWL. If you purchase at either SSR or AKV your vacations would be prepaid until I think 2057, since both of those resorts are newer and are contracted longer. With inflation, the cost of accommodations can only be expected to increase each year, therefore, you are locking in future vacation accommodation costs at today's prices. One other thing you must look at, however, is your usual vacation practices......are you satisfied with staying at a Value resort.....many people are. If so, the initial cost of DVC may not be justified for your family. The other thing you need to be aware of as another poster said.......DVC is a timeshare program and as such, daily housekeeping services are not provided.....you do get Trash and Towel service on your 4th day of a weekly stay (housekeeping replaces your towels and empties your trash only)....no full cleaning unless you pay extra for it. A full cleaning takes place between guests only. However, if you are in a 1 bdrm it's very easy to wash your own towels since you have a stacked w/d unit plus a full kitchen for your use.
If you run the numbers and it seems like DVC may be a good fit for your needs, simply stop by one of the many DVC kiosks in the parks when you're at WDW and schedule a DVC tour and presentation during your stay. You'll be blown away by the AKV models, which are at the DVC presentation center at SSR. They are absolutely gorgeous.
For our family, DVC was one of the best vacation decisions we've ever made. However, I will say knowing your accommodations are paid for does tend to make the decision easy when an airfare sale comes along!!! And yes, DVC members currently get $100 discount on AP's or $125 on PAP's, so that's also a very nice plus.