I'd have to do a full tally at some point, but the math could be very hard to calculate, especially because Tesla doesn't put a specific price tag on Supercharging anymore (that I know of). Even though I'm at nearly 80,000 miles and take frequent long trips, a majority of my miles are still local (fed by my regular charging at work... about 2 cents a mile). Last time I did the calculation, I came up with about 40k to 50k miles on Supercharging (based on a $2,000 upfront fee) to break even with the cost that I pay for public DCFC, so I would just be at that point now.
However, public DCFC does appear to be getting more expensive, but free Supercharging also appears to be going away. The Model 3 comes with a 400 kWh a year allotment, I believe, so that could also be a consideration. But then, outside the Bolt EV, vehicles that charge faster on the current public DCFC pricing will be paying far less.
Basically, I think there are too many factors to consider to give a definitive response, but I'll try to take the time to do a full accounting of my cost of ownership.
I'm not sure whether you're implying that I, personally, don't do that, or whether you're just informing the community that they should call for support before simply assuming the charger is broken (to which I agree).