I deeply disagree with your math assumptions ($12/point?) and what you are perceiving as risk. Buying/renting points is a risk, as sellers usually require upfront payment, and transfer is permanent, so this all better be right. This could be assuaged with escrow, but that adds more cost and complication.
Maybe you bought some $12 distressed points in Covid from a Canadian who couldn't go this summer, but good luck with that every year. But sure, buying distressed points is cost effective.
Just buy a big SSR contract, amortize the closing/commission over the 10 years, and that's how you come out at the 12$/point. The most cost efficient vs cash of all is use any of the cheaper points for the eye-popping rate rooms, like Poly/VGF. The most cost efficient period is to stay at SSR with your SSR points.
This arbitrage only sort of makes sense for you because you are holding overpriced points. You could do the same arbitrage using your own SSR points smartly at 7 months. Then you'd have a few months to keep the 11 month window, you'll never rent for $19 with the wrong timing.
So, if SSR costs $10.26 to maintain, and BW $13.63 (
DVC Resale stats) you went through all of that for $5/point. Add in commission to sell and closing cost to buy, and tell me how many years that takes just to break even. If you bought in the 90s, your math is looking better, but maybe still even better to sell and buy a longer contract with 2042 resale prices so high right now. THAT's how you would get actual cash to pay your dues for free. Trade in your BW for some AKL.
Also, this seems to misunderstand the structure of DVC. It was never to "pay a lot of money upfront and never have to pay for a hotel." In fact, DVC's dues are among the highest, if not the very highest in timeshares in general. That is how the system was designed. You can read a lot more about the itemization of these charges, and the minor discrepancies between resorts, and all about the upkeep and servicing of the hotels and related services. If you are looking for a timeshare with minimal dues, they do exist, but this is not that timeshare.