Yes, they are being conned, and that's why I keep drawing attention to the issue.
Actually the last price for the Nissan leaf battery was £16000 and the car double that including the battery, which has a five year warranty.
Work it out for yourself. A smallish hatchback which if petrol/diesel would cost around £12000 . The £32000 Leaf at say four years old will be unsaleable, since no-one will pay anything for it, knowing it's almost due a new battery at more than the price of a new equivalent ic car. Basically it's £32000 for up to five years motoring in a small hatchback.
Being a short range mainly town car it will only achieve less than 9000 miles a year at most. In fact few current owners are reaching anything like that, but I'm being generous. A petrol car would use at most 200 gallons to do that, at a cost of roughly £1200, or £6000 over five years. Deduct the cost of the electricity to charge the Leaf, which won't be much, but still the economics don't equate. £32000 less say £5000 still adds up to £27000 for a small hatchback. Currently the government give a £5000 grant against the car cost, so that reduces to £22000 while it lasts. That's still way more than the £12000 for an ic hatchback which can be sold after 4 years for about £4000, reducing the net cost to £8000.
The equivalent Renault looks cheaper since they rent the batteries, but I've shown previously how the annual rental of the battery escalates, amounting to the same thing as the Leaf after four years, the maximum rental term.
They are toys for the rich, or for committed environmentalists who are prepared to pay £27000 for their beliefs, instead of £8000.