It is more complicated than a simple multiplication problem. You are comparing a dollar amount today vs. the value of those points in 50 years.
You can only estimate based on certain assumptions.
For example, just for illustrative purposes, Let's say that today those 100 points get you one week in a
DVC studio. The market value today of that week in a studio is, for example, $1,750 ($250x7) Note that these are made up values, just to compare.
Now, assuming we want to use DVC each year for the next 50 years, and we want to know how much DVC is saving us vs. simply paying for the studio each year, we need to make certain assumptions of how much the cash price of the studio will be in the future.
If we assume that each year, the cash cost will go up 2.5%, we see that by year 50, our week stay will cost $5,870.
Keep in mind that DVC costs more than just the initial purchase price. There are yearly maintanence costs and property taxes. If we assume those go up each year by about 2.5%, we can then estimate each year's annual cost, add those to the purchase price, and come up with a grand total net savings, based upon our assumed inflation values of course.
If you are curious, using the above simple example, if today's maintanence fees for the 100 points are $451 per year, this brings the total cost of DVC, including purchase and 50 years of ownership to 54,765. The cost of paying cash for the week each year for 50 years comes to 170,597.
But wait, there is more! This isn't a fair comparison yet as we have not accounted for the $10,800 DVC purchase price that you aren't paying up front if you simply pay cash every year for your stay. Instead of buying DVC, if you invested that at 5%, you'd have enough money by around year 38, to pay cash for your final 12 years, meaning your real cash cost over the 50 years would be around $109,000.
However! If you were able to maintain a 12% average rate of return (compounded annually) on your original 10.8k balance, by year 23 or so, you'd have enough cash built up to pay for the remaining 27 years of your stays, meaning up to that point, your costs will only have totalled about $53,500.
Confused? so am I.
P.S. Here is the kicker. Instead of buying DVC, if you invested that 10.8k and achieved a 12% average rate of return, and didn't spend it on anything, in 50 years you'd have 2.5 million dollars. remember that things cost 3x more then than today, but that is still a lot of money. This is one way to calculate the "true cost" of spending the money today.