If you have been following the resale market you will note that a resale is approximately 15% to 20% less than buying thru Disney.
First, you need to factor in the contract the total points banked or barrowed. The value of the contract will depend upon that number.
Second, if you buy thru Disney the closing cost is included. If you buy a resale it will cost approximately $450 or more depending upon the number of points purchased.
Third, you can negociate with the seller closing cost, reimburement for maintance fees, and price per point. As you may know Disney has the ROFR ( right of first refusal )and will excerise that right if the cost of a contract falls below $67 per point.
Fourth, most resales at this time have 38 years remaining on the contract. SSR currently is selling a 50 year contract at significantly higher cost.
I think you can save thousands of dollars if you buy a resale; however, as I mentioned above not all contracts are equal.
I purchased a resale and via Disney and saved thousands. In the latter instance I saved 15% thru Disney because my son was a CM and received the discount.
You have a lot to think about. However, I think a resale is a good value, if you find the right contract. Good luck I would recommend a resale if the price is right.