Agreed.
It is still possible to get a direct purchase to pencil out with zero salvage value. It just takes a long time! The last time I did this, I had the break-even point a good 15-17 years into the future. That was assuming a 30% room rate discount for cash, an amortization rate of 4% for the purchase price, and the same rate for inflationary increases in room rate and dues. It varies based on what you pick for your time-value-of-money rate---the higher the rate you pick, the longer it takes because of the large up-front costs.
The other way to look at a purchase (direct or resale) is not "I am saving money with this" but instead "I can vacation in the manner I would enjoy at a price I can afford."
I'm a big fan of the second way, and that's because in my 15-20 years of experience as a timeshare owner, owning timeshare has not saved me money. At all. And that's despite the fact that, up until a month ago, I put my portfolio together at a total acquisition cost of approximately "free."
Why, if my timeshares were all free*, did I spend more money? Because I traveled much more often. The lodging was a screaming deal. But that doesn't save me money on airfare. Or food. Or entertainment. Or really anything else.
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*: Well, except for the most recent one. That was a doozy.