[_ph_]

Here in Germany, liability limits are usually much higher. 100 million isn't unheard of. The reason certainly is partly advertising, but also because some freak accidents have caused these amounts of costs. A few millions are not uncommon for bad accidents where for example semis with delicate load are involved.

The most severe damage caused so far in a single car accident in Germany is about 30 Million €: https://en.wikipedia.org/wiki/Wiehltal_bridge

Fortunately, they were finally able to repair the bridge and didn't have to completely rebuild it, which would have been vastly more expensive.

[gambiting]

The minimum required from any insurance in the EU is €5M in 3rd party liability, no vehicle insurance can offer less. The ones offering 20/50/100M are doing it mostly for advertising, there's no appreciable difference in cost.