To be fair, I can’t see many owners trying not to save money wherever they can running what’s one of the guaranteed money pits out there and whilst Kumho’s aren’t the best by any stretch they are not dire either.
I can’t think any ~119k mile M5 is cheap to maintain but to be fair it’s MOT history looks good.
I imagine it’s presented a fair few eye watering bills in its time, perhaps the poor sods had it from new when he was wealthy but now can’t afford anything other than the best cheapest he can find.....
If ever there was a car to bankrupt you, that’s one of them!