Hmmm...calculations.
$7 Billion dollars annual revenue.
I believe there are roughly 55,000 supercharger stalls open globally, and roughly 25,000 stalls in the US (rounded numbers from supercharge.info).
If that revenue is taken globally,then dividing the revenue over 55,000 stalls -- is it possible that the average supercharger STALL brings in $127,000 each year? $350 daily? I know rates vary by location...but if I assume some kind of average cost of 50cents per kWh, then that would mean the average stall delivers about 700 kWh on an average day. That's about 10 big charges (70kWh each) or 20 small-ish charges (35 kWh) per day. Actually sounds reasonably plausible! And that would only really imply an average occupancy of (very roughly) about 7 hours per 24 hour day on average, if I assume an average, round-number charge rate of 100 kW.
I know some superchargers stations are empty most of the time...but I could imagine there being way more stations in crowded areas that are crowded all the time. I know there are a few that I pass that seem to always be full during daylight hours.
If only US revenue counts, then the numbers are higher -- divided over 25,000 stalls, that $7 billion comes out to $770 per day per stall, which seems high but is probably actually possible at busy stations.
And I've totally ignored possible idle fees, etc...but I have no idea how to estimate that...
Interesting...
