Everyone has to do what is right for your situation. We purchased last year and financed a large portion of it. Our scheduled yearly cost for payment and dues for the next 9 years is about equal to what we would pay for a week at a deluxe resort. So for money we would spend anyway, we have 40 years ownership remaining which will have some value. Had we just taken the 10 vacations, we would have nothing left ahead of us.
Our DVC membership allowed us to host my entire family in 3 rooms at AKV for the trip that we never got to take when we were kids. We still might not have been able to take it if we were paying cash for those rooms.
We could have saved for 2-3 years to pay cash for the membership before we purchased, but we would never get back those 3 years when our kids are preschool and early elementary aged which have been awesome experiences so far.
If we chose to do so, we could pay it off by the end of this year. So I wish some of you wouldn't be so judgemental on how other people should spend their money everytime this comes up. Money is just paper. Experiences and memories cannot be replaced.
ETA: For those that pay cash or are saving, that is great. I am not here to make it sound like that financing is absolutely the way to go. It is what we thought was right for us at the time. There are pros and cons. Everyone has to evaluate their own situation.