[Pamar]

Not sure I understand your point about

Everybody already has local regional tickets anyway. And most people can't be in more then one place at the time anyway. And most people stay in the same region most of the time anyway.

I live in Rostock. So if I want to go to Berlin or Hamburg (you know, where stuff like actual airports are) I am crossing "regional borders" even if it is a 200-250 km trip to each city

[panick21_]

Most people don't use regional services to travel long distances. And you pay for proper inter-city services.

The point is, if you are in Hamburg, you are no longer in Rostock. So you are only using regional services in exactly one place.

[ygra]

At least from Rostock to somewhat closer destinations you have both options. There's a bi-hourly IC to Hamburg or Berlin and another bi-hourly RE towards the same destinations. They're not terribly different in terms of travel time, but one is a regional train and one is an inter-city train.

Sure, long distances (I had to travel from Rostock to Tübingen last weekend) are typically not taken with regional trains (although you technically can; I did that as a poor student a few times, it just takes 16 hours instead of 10), but over medium distances (around 2–3 hours) you often have both options.