So, yes, the RAV4 hybrid at about $2/gal is close to the Supercharging rate. But that's already a hybrid and assumes that the price of gas doesn't go back up. So what Tesla's done is to make long distance travel a little more expensive, but still cheaper the 90% of the vehicles on the road, even with current gas prices.
So the moral of the story is to not use Superchargers. Charge at home or L2 chargers more.
I've taken at least 5,000 miles of long distance travelling and (while at the old rates) I don't think that I spent over $100 in Supercharging. That's because there were a number of other options along the way, charging at hotels, at homes, etc.
Also, go look at the competition for DC fast charging.
And look at it from a business model. Just how much do you think it costs to build a Supercharger? to maintain one? Amortize that over a few years and see what the cost of charging should be.
Sure, the price increase stinks. And here in Georgia it is really weirdly set. Superchargers across the street from each other have different rates.
Have you done your research? It costs around between $250,000 and $300,000 to get a supercharger up and running that is between 8-12 stalls.That is capex depreciated over 10 years. Opex for supercvharging stations we don't know but , let's say it's equal to depreciation which is 10% of cap-ex. So the running cost per year of the supercharging station would be capex + opex which is 20% of $300,000 which is $60K. In the US, there are around 500 stations? Tesla would need to charge 30 million a year over electricity costs to break even.
However, it seems that the majority of people charging now after the price increase are S and X cars leeching from the system because they have free lifetime supercharging. So tesla will need to cover what the S and X cars leech, which is why I think they really increasing the rate for Model 3.