Hi,
that is wrong. The concert is never sold out. In the last two weeks I looked at the Saalplan at
www.eventim.de every day and there were many many seats free. In the last days you could buy also tickets in the blocks near the stage, they were blocked before I assume. So there were over 50 tickets from the most expensive ones in the "Unterrang" and over perhaps 200 tickets of the seats in der "Oberrang" free. Since thursday u can t buy tickets at eventim for the concert, because they send the tickets by post, not enough time for that. Perhaps this is the fact, why they call it sold out.
Make the example: Look at
www.eventim.de the concert for Berlin. Click at the Saalplan-Button. U will see, many seats free, also good ones, at Berlin !
Greeting
Christian