True, you pay less "out of pocket" doing a 5 year loan, but you have to come up with over $1,000 more per year. Even assuming you can do that, if you can invest that money at a higher rate than you can borrow the money, you are actually ahead by doing the 10 year loan.
In other words, you could finance for 10 years, over the first 5 years you would pay $1,070 less per year than if you had done a 5 year loan. You could invest that money, have that plus your earnings over several years to pay towards the loan in years 6-10. If you earn less than your loan rate, then you DO end up paying more for financing over 10 years. But it wouldn't be $17/point. And if you earn a higher rate of interest than your loan, you'd wind up ahead.
There is an "opportunity cost" in giving up $1,000 per year.
As for the interest rates in the double figures, as Mickey7861 said, that is the rate through Disney. The advantage to it (in addition to the convenience) is that it could be tax deductible as a loan on a second home (most DVCers do deduct their interest I would guess). So it might be better than taking out an 8% personal loan or a fixed rate cash advance from a credit card at say 7.9% (neither of which would be tax-deductible). Of course, a traditional home equity loan would probably be cheaper, but not everyone has house equity. And I haven't seen too many banks offering personal loans under 7.5% (what Disney's 10.95% rate is for someone in the 27% federal/5% state tax brackets who can deduct the interest).