I did the math on the Toyota and based on how many miles I drive in a year (I work at home) and the expected life of the vehicle, it'll run reliably until I'm 169 years old. :)

The thing is with the used car market is that maintenance cost is not paid by all the owners. Its paid only by who happens to be holding the hot potato when the battery is screwed, and most people with means aren't holding a car to 150k miles, that's about how many miles an ICE car has in the maybe $5kish used range. The sort of person buying a $5k car can't afford a $10k battery. They might not have access to $10k on a line of credit either. The worst similar thing that could happen for an ICE car is a timing belt going before you replace it and screwing up the engine or the automatic transmission needing replace, both issues much less costly than a $10k battery but also costly enough that people sometimes walk away entirely from the car.