The mathematical formula to value the out years is a geometric progression. X=((1-r)^n)/(0-r) where n is the number of years left and r is the deflation rate. I’d suggest taking what you’re making on average in your retirement accounts over the last several years, and subtract either 3.5% (
DVC inflation rate) if you think you would rebuy when the contract expires, or 2% If you think you wouldn’t. So if you’re average is 8% then r in your equation would be 0.055.
X is the the equivilized number of years left for The various resorts represented in today’s dollars. So BCV/BRV/BWV in this example would be 12.3 current years, SSR 15.4, Riviera 17.1. Divide purchase price by equivilized years and add dues to get an apples to apples comparison to cash prices, points renting, or to compare resorts.