For me, I want to avoid the stress would come in AFTER I did all that analysis. I don't want to be worried about making all those trips on time, in the right year, banking, borrowing, etc. One year, 5 years down the road, a great opportunity to travel to Egypt, or Europe, etc. may come up that you grab with both fists, and now you've "blown" your
DVC savings model. Or, maybe, you decide that an extra weekend at Aulani is in order.
For me, it's more of "it will all balance out, or it won't" attitude. For example, in early 2020, we, like so many others, did a good bit of Covid stockpiling (hoarding?) of canned and dry goods and frozen foods (no, we didn't hog the TP). Over the course of last year into this year, we actually found ourselves asking "hey, didn't we put some XXXX in the garage last year" and dipping into that stockpile out of convenience, not necessity. Conversely, we also cleaned out the pantry last month to make room for holiday supplies, and found a not-so-small amount of canned goods that had actually expired and had to be thrown away. Not to mention about 80% of the stuff we froze. Best-laid plans, as they say.
Obviously cans of chili and soup and frozen chicken aren't DVC points, but the idea that even the best planning can go off the tracks at some point down the road, based on myriad unforeseen events and forces is translatable.