I have one (but I stopped updating it once we decided to just switch over to direct since at that point it was no longer a rational break-even decision as much as a "we just want this" decision

)
Mine has 4 tabs:
Tab 1: Point $$ Per Year
Initial contract cost is spread out over years on contract to get the base price/point/year
Annual fees/point are added to the base price every year to get total cost to me of that point in each year
***You need this tab because if you have bookings using banked or borrowed points, the cost/point is different each year and you will need to account for that
Tab 2: Total Cost of Ownership
Includes Purchase price plus annual dues each year as a running total
Has a cell for Cost Less Savings (savings comes from next tab)
Tab 3: Cash Price of Bookings
Column headings for: Trip Date, Cash Value of Room, # Points Used, Point Cost, Savings
**point cost comes from tab #1 times the number of points used (make sure you are taking into account which UY your points are coming from), savings is obviously cash cost less point cost and this is the number carried to Tab 2 to work out cost of ownership less savings
Tab 4: Breakeven Analysis
Total Cost to Date
LESS: Total Savings to Date
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Sum/# of Points = Breakeven Price/Point if I were to sell
My chart assumes we would be staying in the same room whether or not we were
DVC members, which is true for our family. If you would normally stay somewhere else, you would need to change the cash cost for booking to match wherever you would stay instead of the DVC room cost.