DUS-BOS-DUS == GT-B-GT

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No, I assume I’m not expected to understand this. But … my business trip to the States will be, excluding taxes, as cheap as my weekly train ride, including 19% German sales tax, from Gütersloh to Berlin and back (400 km each trip, about 80 EUR regular in the 2nd class coaches per direction).
Taxation included, the flight is about 3.5 times as expensive as my weekly train ride back and forth — but still, considering the distance covered, it’s cheap as hell. So, let me ask, why is the train so fscking expensive?