My HPWC and dual-chargers are my primary charge method. I'm OK with the little bit that costs me on my utility bill, or perhaps one day paying for a solar installation on my roof vs. handing over a lot more cash to the oil companies to use finite resources. Even with my lower annual mileage than the average, I still pay less for the "fuel" of my MS than I ever did with my ICE.
While I appreciate having "free SpC for life of my MS", it's cost was baked into the price I paid for my MS, and I use it infrequently only on road trips. As such, I'll likely will never get my money's worth out of that part of the transaction. If a future Tesla or EV made me pay for charging by unbundling it's cost from that of the vehicle, I'm OK with that -- I'm gonna pay for "fuel" one way or the other, so given a choice, I'll just do the analysis which is better for my situation.
What IS important to me though is AVAILABILITY of SpC (and backups to it) when I need to charge away from home. I purposely didn't order my MS until the SpC network was in place for longer road trips I have taken or anticipated going on one day -- I used EVTripPlanner and figured all that out before I purchased. Like many, I suspect, I'm spoiled by many years knowing a "gas station is on every corner" or "I can fill-up in the next town" even if their price may be higher than what I'm used to paying. For the most part I never considered 10 minute stops to fill-up with dino-fuel along the way when planning road trips or estimating arrival times at the other end. With my MS (or any EV), I DO have to plan where charging locations of what type are located. I DO have to plan for much longer charge ("refuel") time, even with a SpC. I DO have to be more concerned with the possibility a charger may be in use (or heaven-forbid, be down) when I need it -- especially on certain routes where workday or Friday night/Sunday afternoon travelers put a spike demand on dedicated charging needs in certain corridors, or when owners are inconsiderate of others by leaving their vehicle at the charging station longer than really necessary. Those things may not be a concern some times, but others it is. I must purposely consider those issues now that I own my MS, and generally start much earlier than most (normal) people to get ahead of the possible crunch, change days I travel more than I used to, and provide myself more buffer to ensure I reach my destination when I planned to.
All that to say, if it got to the point where Tesla or even another company offered SpC capability at additional convenient locations, or perhaps as a way to help with (or guarantee) improved availability when I need the charge along my route, putting a few bucks into the charger would be a huge plus from my POV. Sure, if it were "free", I'd take it, but IMHO I'd still be helping Mother Earth and probably save a few bucks overall for a little additional convenience and less stress owning my Tesla/EV along the way.