The main problem with may these spreadsheets is that they come from places interested in getting you to buy DVC, and buy resale DVC. The tend to
overstate the ROI substantially because they are missing assumptions on:
- (i) opportunity cost - i.e., if I don't spend a chunk of money on DVC, I have that chunk of money to invest in the stock market, or bonds, or a savings account etc. (the link you provided seems to totally ignore that)
- (ii) cash rates from renting alternatives rather than from Disney e.g, rentals via David's, Redweek or from another owner directly (the link you provided assumes rental costs per point start at $27.45, which is quite high, making ownership more attractive)
As a result, that spreadsheet shows resale DVC has a breakeven point in 5 years and direct DVC paying off in 10 years. But both of these missing assumptions have a large impact on the result.
I can give you an
extreme example for illustrative purposes where DVC will never pay off... For example, suppose I buy 100 resale points for $16,000. If the alternative to owning is renting 100 points at $25pp ($2500), but I make 25% in the stock market every year, then keeping that $16,000 invested generates $4000 in the first year and I have $20,000 after 1 year. I can sell $3000 (some of that is taxable capital gain) and now, even after tax, I can still pay $2500 for the rental and my remaining balance invested in the market will be $17,000 - which I can now keep invested and it will continue to grow even if I rent DVC points every year, and even if rental costs increase by 5% per year. So with these (unrealistic )assumptions DVC never pays off.
Obviously that was a ludicrous example - nobody can rely on 25% returns, but 5%? 6%?, 7%? - those numbers matter and are not negligible. That was just to make a point that those analysis can be heavily flawed either because they come from a source that wants to prove a point that helps them, or because the person who did the analysis is not careful. Aside from the opportunity cost, we all know one can rent points at $20-$25 per point (even from reliable brokers), so why assume discounted rack rates at $27+ unless you just want to make a purchase option look better faster?
In reality, DVC does pay off over the years, but if you assume that the person who might rent keeps their money invested at a reasonable rate of 5%-7%, and they they rent directly from owners or via David's at more reasonable rates, then the breakeven even vs a resale purchase might come in 15-20 years, not in 4-5. That's not terrible from my point of view either, but does bring into question the value of buying some 2042 resorts at current prices, probably a topic for different threads! With those same assumptions, the breakeven vs. a direct purchase in the $200+pp range is a lot more questionable.
By the way, another assumption that matters a lot (because of compounding) is the percentage growth in dues vs percentage growth in rental costs. Most will assume they grow at the same rate (say 4%), but if dues grow at 5% and rental costs grow at 3%, that can make a difference between breaking even in 15-20 years and never breaking even before the contract expiration in the 2060s...
In sum, take everything with a grain of salt. Best to do you own analysis and vary your assumptions to see how much they matter!