Well, then there's also a bunch of other stuff I didn't mention:

• cleaning the car costs a little every now and thrn because you mustn't do it in your driveway
• speeding tickets and other violations occur depending on how well you abide by the rules
• TÜV et al. cost a little every few years
• some parts may break due to bad luck - even Toyota cannot prevent stone chips on your windshield

There are a lot of small hidden costs which all add up, even on cheap cars.