Here is my methodology (I'm a bit of a financial nerd so take it with a grain of salt):
1) Setup a Net Present Value chart for discounted cash flows. Basically, I looked at all of the money coming out of my account on a year by year basis such as financing payments (adding
DVC to the mortgage, so I'm comparing the monthly payment vs what it would have been without adding it to the mortgage) & maintenance fees. I then net this against the amount I would have paid for a hotel room (this is the variable I played with).
2) I used different inflation rates to account for US inflation, hotel inflation, and maintenance fee inflation.
3) I then discounted each year's cash flows back to present value.
4) I then played around with the hotel price variable until I got to a point where the NPV would be zero (or close to).
Using my numbers (again, these are personal based on my exact situation), I found:
Actual Hotel Cost Per Night in 2019 dollars = $263 per night (approx the cost of a moderate)
However, because in my calculation I assumed that hotel rates would appreciate at a faster rate than US inflation, if I were to stay at a hotel that cost $164 per night today (value) for the next 35 years (years remaining on SSR contract), I would spend the same amount over the lifetime of the contract.