Just to explain the problem of going every 3 years with
DVC.
Let's say you get a 250 points contract.
You have 250 point in your 2015 Use Year, 250 in the 2016 and 250 in 2017.
You plan to go to WDW during 2016 UY, the first two weeks of July. Your favorite resort is AKV and you want a savannah view. It's 744 points. Banking and borrowing you have enough points, but you have an extra 6. They remain in the 2017 UY, but you don't plan to go again until the 2019 and points cannot be banked more than once. So you actually loose these points. They are too few to book any night so you cannot rent them and it's very difficult to find someone who might want to transfer them (and use their only chance to transfer points in for just 6 points). They are not much in the grand scheme of things, but it's still wasted money.
But let's say you want to book BLT lake view. It's 772 points. If you bank and borrow all your points you get to 750, so they are not enough. And transfering in 22 points is not easy (same reason as above). Will you cut a night? It's 720 points. What to do with 30 extras? You can rent them, but it's difficult to rent exactly 30, so you'll waste something as well. And it's still some additional work involved.
And what if you have to cancel a couple of months before leaving? You can bank the 2016 points used for the reservation into 2017 to reschedule, but banked and borrowed point must remain in the 2016 year, so you won't be able to reuse them. You can try to rent them but it may be difficult if you are near the end of your UY. You might loose them all. And also, next year you have only the banked 2016 point and the points you can borrow from 2018 to book a vacation in 2017 (the 2017 points were borrowed initially), so you can book less days.
You can make it work, but you must be ready to "play DVC the game" very well (and learn all the ins and outs of the system).