Understand too that fast electricity at peak times is pretty expensive. I don't think they have a significant margin on electricity, just the benefits of volume.
And they certainly haven't been resting on their laurels. The entire supercharger network has doubled in recent years enabling more trips than ever.
Back in 2018 you were counting on these individual stations which to their credit never let me down. Now as I plan yet another cross-country trip, there are dozens of superchargers that I skip past as in some areas they are only 20 miles apart. Great for the consumer imo.