It'll be interesting to see what happens with the 2nd hand market, as regards the wider adoption of EVs. I've never been able to even nearly afford a new vehicle and most of the motors I've bought have been 10, 20, or more years old.
With a bit of luck and some decent maintenance, you can get cheap reliable motoring from buying a 20+ year old vehicle. I doubt we'll see the same with EVs. For a start, the batteries will need to be replaced after X years. Judging by how similar battery tech lasts elsewhere, that could be in as little as 5 years. And a replacement battery is going to cost you about half the value of the car [although, admittedly this will come down with economies of scale].
So, while I might be prepared to fork out a few grand for a 20 year old wagon, which seems to have been looked after, and be pretty confident that, with a bit of TLC and fettling, it will perform somewhere approaching how it did when new, I'd be a lot less willing to spend a similar amount on even a 5 year old EV, never mind a 10 or 20 year old one, knowing that the battery must have had hundreds if not thousands of charging cycles in that time.
We all know, from our phones and laptops that, after a few years, they still work fine, but just won't hold charge like they used to. So, will the same be true of EVs? Will your range keep dropping and dropping, as the charge cycles mount up, until 100% will barely last you til the end of the street? And, what then? You either stump up several thousand for a replacement battery, or try and sell the vehicle on. And I would imagine the market for a 2nd hand EV with a range measured in hundreds of metres wouldn't be that huge.
So, yes, you might be saving 75% in fuel costs at the moment [although that's not likely to last, given the way electricity prices are going]. But you also have to factor in the cost of that new battery after 5 years or so. It's a bit like if any time you bought an ICE vehicle, you had to budget for the fact it was going to need a new engine every 5 years [Insert Nissan ZD30 jokes here]