If you were always going to book the most expensive 1BR at PIT or VGF every time anyway, then getting in at 7 months with SSR is indeed savings each time you do it. But it wont work every time and will likely get harder over time, even for 1BR which is usually the easiest. If you are fine with staying at SSR or eating a loss on an SSR contract if everyone tries to get out of their contracts if/when 7 month availability tightens up then that is an option you may be okay with. I just don't get the gamble myself. As the saying goes the juice just isn't worth the squeeze to me when there are other options out there. If it was SSR resale vs current Direct points as the only options then that would be a different story and even I would buy SSR. But there are a lot of other good options in a close enough price range.
As most members know, the cheapest views usually book first. So if you would normally book the cheapest view (even if it was a 1BR) but you end up having to book a more expensive view to get availability at 7 months, with a quick look that can range from an extra 54 up to 145 extra points for a week at the more expensive view(s) at Poly/VGF in the 1BR. If you have to use a bunch of extra points each time you stay like that, you may not end up saving anything, or maybe even spending more even with the cheap points. An extra 54 to 145 points each time and their dues can eat into that savings or the "extra" points you got by going with SSR very quickly. This difference will be less with the studios, and more with the 2BRs.
A member can buy the more expensive points even at VGF or Poly, but book the cheaper view room and still come out ahead. And with VGF or Poly you would get an extra 10 or 12 years. In 2054 you could sell the contract and get some money back when SSR members are left with nothing. And the whole time this member would always have the option of booking the better view if they wished, and wouldn't have to gamble on unknown long term 7 month availability.
It's multifactorial and every member has to make their choices.
Edit: Also some of the options actually have cheaper dues than SSR. Like BLT and Poly