The pro-rating of dues makes it a bit more complicated to think about, but okay if you sign on Sept 1, 2023, and
DVC prorates your dues so that you only owe 4 months worth, not 12 months worth, of 2023 dues, theoretically you could come out ahead or at least break even if you rented out your Feb 2023 points. That being said, they would have to be used by Jan 31, 2024 or banked by Sept 30, 2023 (fairly tight timeline). You could also potentially bank them right away but still rent them out for the Feb 2024 UY. Then you could bank your own Feb 2024 UY points into 2025, making them available for your March 2025 trip.
The advantage, I suppose, is that you buy in now at today's rates, instead of a potential rate increase... could maybe take a short trip even before March 2025.... use some of those sweet sweet blue card perks... or rent and cover most of your 2023 dues which would be pro-rated anyway.