i'm sorry im a little confused. Can you clarify why its not an extra 18 years and how i would pay equally for them?
If you buy 100 points at BLT at $115pp resale:
At closing, you pay $11,500 for the points, ~$500 for closing costs, and $562 in annual fees to the seller, for a total of
$12,562 at closing.
Then, for 43 years you pay annual fees (that increase ~2-6% per year) on your points. On January 31, 2060, you are done with DVC and you've spent
$60,061 over 43 years on the initial buy in and annual fees (averages to
$1,397/year).
If you buy 100 points at Beach Club at $105pp resale:
At closing, you pay $10,500 for the points, ~$500 for closing costs, and $627 in annual fees to the seller, for a total of
$11,627 at closing.
Then, for 25 years you pay annual fees (that increase ~2-6% per year) on your points. On January 31, 2042, you are done with DVC and you've spent
$33,865 over 25 years on the initial buy in and annual fees (averages to
$1,355/year).
So yes, your contract lasts 18 years longer, but you're also paying 18 more years of dues. If your sole reason for wanting BLT over BCV is because of the expiration date, it is helpful to see the numbers to see that you're not "losing" significant money by buying a contract with a sooner expiration.
In fact, if I look at the chart in the spreadsheet below, in UY2041, BLT is at $32,498 which is $1,300 less than BCV, but mostly driven by the fact that BLT currently has lower annual fees (which could easily change). Of course, you could sell BLT in UY2041 to recoup money, but if your intention is to see it through to the end...
You can play with this spreadsheet if you'd like:
https://docs.google.com/spreadsheets/d/1nJzcHrrB7HzZ1kjXFLWvcFcnHZ50PIxkEFvvX8ttRVY/edit?usp=sharing