I would only need SC access once or twice a year
Like you said though, if it's part of a package like larger battery or dual motor, I'll pay the baked in price for it.
To the 1st part I've cherry-picked....
I thought the same thing. But then I've realized that it would probably be more. Most of my family is within 1/2 a battery, out-and-back, so not as big a deal. Some of the wife's extended family is close to 150-ish miles out, meaning I'd probably need some juice on the way back (and luckily they're all near existing SC's), so I'd NEED it probably closer to 10 times/year. Then the semi-annual MA-to-VA-and back trips. That's 4-6 SC stops round trip, depending on conditions. Suddenly I'm up in the 14-16 SC's per year range. Then you factor in the "just cuz" trips you might not do in an ICE. Wanna go "leaf peeping" in the fall? Jump in and go. Want to just drive aimlessly on backroads for a few hours? jump in and go. Now I'm probably at 20 SC's/year
So for the sake of argument...I'll use my wife's car as the example: 2014 Impreza wagon, CVT, 14.5 gallon tank, gets 36mpg HWY, takes ~$31 to fill these days (can run off 87 octane).
20 full tanks of gas comes to ~ $620. So IF....IF...Supercharging came to $2500, I'd regain the value of that in around 4 years of driving.
But there are some other variables, such as my car....if we were to use my car... 2015 A3, 14.5gal tank. 33 mpg HWY, needs at least 91 Octane, now the savings of using the Supercharging network instead of the Audi becomes $750/yr, and I'd recoup the price of SC in just over 3 years.
And that's not even factoring in-town EV vs. gas use, daily commute, errands, etc. I've only done a napkin-math case study for long distance.
And to your second part....about it being baked in as part of Dual motor or bigger battery, all that much more cost-effective, depending on what vehicle you're coming from. Seeing as your tag says you're from NE Ohio, you're likely looking at Dual motor anyway, as am I. So if they "give" me Supercharging as part of something I've already labeled as "must-have", then it carries even more value to me, psychologically AND financially.
But while we're here waiting for crumbs from Elon, and overthinking this, it's likely already decided what they're going to do...and if it's not, they're waiting to see how partnering with gas stations and restaurants like Ruby Tuesday works out. If they're meeting or exceeding their rollout plans, then we likely won't see any difference in how we "pay" for Supercharging than S or X owners went through.