Keep in mind that you cannot purchase an initial 50 point SSR contract direct from Disney. The minimum size contract direct from Disney must be 150 points. After that you can purchase add-on contracts direct from Disney.
Resale, you can purchase any contract any size available for whatever price you can negotiate with the seller. You are buying someone else's contract. If it's under 150 points then it had to be someone's add-on contract. Example someone bought 150 points at BWV, later added 50 points at BCV, and has now decided to sell the BCV contract.
If purchase from Disney (150 point minimum for your first contract), you can finance through Disney. If buying resale you will have to find your own financing.
Disney has ROFR (Right Of First Refusal) on all resales. Example: You negotiate to buy 50 OKW points from someone for $65/point. Disney can then buy that contract for $65/point and you lose out on the purchase and have to start looking again for another resale.
When you purchase the deed will be changed to your name, giving you all membership priviledges.
It might be tough finding an SSR resale since it's so new. It would mean someone purchased there and now is selling their purchase before even staying at the resort. Of course there could be a CM who purchased under discount and then is selling to make a nice little profit.
All SSR contracts expire Jan 31, 2054. All other
DVC contracts expire Jan 31, 2042.
Also keep in mind that when purchasing resale, most likely you will have to pay closing costs. These costs are basically the same whether it's for 50 points or 200 points. At about $450 closing, that means on a 50 point purchase an extra $9/point you'd be paying. So if you found a resale for $70/point, after closing costs it'd be $79/point for a 50 point contract as compared to about $72.25/point if it were a 200 point contract.
If you purchase direct from Disney, Disney pays the closing costs.
Using banking and borrowing, with a 50 point contract, you could have up to a maximum of 150 points available to use once every 3-years.
But you don't have to do that. You can make any reservation you want for any time you want as long as you have enought points. The minimum reservation you can make is for 1-night. Points per night depend on the resort, room type, and season. The cheapest anywhere is 6-points/night for a Studio at HH Sun-Thurs in Adventure Season
For the 5 Disney seasons, the least expensive points are always in Adventure season and the most expensive are all in premier season.
Studios in Adventure season are HH-6 pts/night, VB-8 to 10, OKW-8, BWV-Std-9, SSR-11, and BWV-Pref, BCV, VWL all 12 points/night.
During Premier season the points are anywhere from 60% - 90% higher.
Points for a weekend, Friday or Saturday nights run from about 90% to 150% higher than their Sun-Thurs night counterpart points.
Example: OKW Studio Adventure Season, Sunday = 8 points. Same room Friday, Premier season = 36 points. (Adventure season Fri = 150% more than Sun = 20 points, and Premier season = 80% more than adventure = 36 points.
If you want to conserve points as much as possible then you will need to stay in Studios. However the best value of using points is probably the 1-B/R units where you really get more of a condo as opposed to a more glorified hotel room (Studios are slightly larger than hotel rooms and have microwave, mini-fridge).
Example, a 1-B/R Sun-Thurs at OKW in adventure season is only 80 points (16 pts/night)
With 3-children you'll eventually need a 2-B/R. Putting 5-people in a Studio or 1-B/R exceeds Disney's sleeping accommodations for that villa. (You can go to the debate board here on the DIS and find discussions on that topic).
A 2-B/R villa at OKW, Adventure season, Sun-Thurs will cost 22 points/night or 110 points for 5-nights. If you went during the summer months of mid June through mid August, a 2-B/R is 30 pts/night or 150 points for a Sun-Thurs stay.
If you wanted then for a 50 point contract you could have a 2-B/R unit at OKW for 5-nights once every three years.
Hope this helps.
You can check out point requirements using the Points chart and/or points calculator here on the DIS (click the buttons at the top of this page), or feel free to download my free DVC Planner program using the link in the signature block below.