It's business, and I think what is commendable about Dortmund's management is that they are always able to maintain the stability of the team even though they always sell their mainstay players, I don't think many can do something like that. And I also don't have high expectations for the Dortmund team, I think they will remain the same as in previous seasons, they will build a makeshift team just to be able to enter the top 4 and get a ticket to the Champion League.
Maintain their stability within a good range is something others need to learn from Dortmund, even after sales of key players, they still finish decently a d not lag behind the way other team do when they have key players sold of, indeed the management of Dortmund has got the business IQ and understands it too well that they know how well to place their team and always getting that which they want bothe with finance, team depth and trophies. Last season they appear they were really aiming at trophies so they had most of their players kept to achieve that but somehow it didn't work as planned.