You pay 9€ and you get 1 ticket. The transport company then charges the government back based on usage.
Why is this a big deal? Well, try finding out how to get anywhere in Germany not using the national railroad. Here's the map [0].
Not only is there hundreds of local transport companies, they are also all part of different, partially overlapping, partially non-boundary-aligned conglomerates for which your ticket might or might not be valid.
It's insanity.
[0] https://upload.wikimedia.org/wikipedia/commons/f/f3/Karte_de...