I bought an 08 plate Prius around 9 years ago for £5k, still going strong with around 130k miles on the clock. The only major expenses have been wear and tear items such as the exhaust, a wheel bearing and brake discs.
I get 50-60 mpg in town, pay minimal VED, no ULEZ and cheap(ish) insurance in a car big enough to fetch a free tall larder fridge once in a while.
And it has a reversing camera which is dead useful around where I live as parking is a nightmare.
We’ll keep this car until it’s no longer economical to repair (or, more likely, it’s gets crashed into by a boy racer when parked up) and then probably buy another.
So, not expensive and not pointless.