Knowing how Yamaha operates, I wonder how long the local workers (the Austrians) can work under Yamaha Corporation management. Actually, 11 M Euro is about right. Bosendorfer has no market share at all. So it will not produce income for Yamaha. The purchase is just to buy the patent.
These are the three key statements from the three articles linked - who are we to believe
This is about as sad as Lenovo buying IBM. (i.e., not very).