I respect your point of view and think it is an important one to bring out for those that are considering
DVC.
But I also think that the whole point of the OP's post is that there is no one right way to look at things when it concerns purchasing DVC.
For some, financing makes sense and for others, paying cash does. I do agree that before someone buys in to DVC they should look at it from all angles and understand what it is going to do for them in terms of financial obligations.
All of us are vulnerable to having things happen in life that could change our course and that financing DVC will play a role if that happens. But so will depleting savings to pay cash.
Personally, before joining DVC last winter, I probably spent well over $40,000 to pay for my trips to WDW over the last 10 years. Now, I certainly could have taken 1/2 the trips and put the other $20,000 toward my mortgage and have less debt. And, some will call me silly for spending so much for "vacation" vs. making myself more financially stable.
But, the decision was mine and I made it understanding my choices.
The bottom line is we never know what tomorrow will bring and must look at our own situation and make the decision that is right for us.