I appreciate the sentiment of the pay cash or nothing crowd, but from a strictly numbers standpoint financing can make sense. Consumer Reports did this analysis in 2016 on Poly assuming a $168/point purchase price financed with a 7 year/8% loan:
https://www.consumerreports.org/personal-finance/is-a-timeshare-vacation-a-good-value/
Even with closing costs, maintenance fees, and interest they found a break even point at 13 years when compared to staying at Poly cash.
Since most folks on here buy resale and may have access to lower interest money (e.g. a HELOC), you can potentially be looking at a much earlier break even point due to the lower costs than the Consumer Reports analysis.
Time value of money is a concept hammered by the pay cash crowd. I would just say that there is also money value to time. We can't take for granted the fact that we'll be around, or healthy enough, to enjoy something like DVC when you are finally able to pay cash. The reality is that resale DVC has mostly shown itself to hold its value and even be an appreciating (albeit mostly slowly) asset in the long term. Anything can happen but I think that financing DVC isn't even comparable to something like financing a $70,000 luxury car.
I say this all not to say that you should buy DVC at any cost regardless of your financial situation. Far from it. I just think it's clear that you you have to make a much more nuanced analysis than just accepting "pay cash or nothing" as the gospel and being done with it.