~Snip~
Dortmund's habits like that will be difficult to change because their philosophy is to get more money by selling players who are already good after being in the Dortmund team itself. And it is true that a team like that will always find it difficult to become champions because they always let go of what they should maintain in order to increase their own strength. Although at other times Dortmund is always able to produce ordinary players into great players who will be glanced at by more big teams every season.
Dortmund have always made money from their talented young players, but if they continue like this they will struggle to win trophies. Almost every season Dortmund always sells young players with high talent, then they look for other cheaper young players to fill the empty positions. It is no wonder why Bayern Munich has always dominated the Bundesliga, because one of its toughest competitors always loses quality players every season.
Dortmund habits were also once practiced by Arsenal, but now Arsenal has started to change its strategy, they have started to bring in quality players to win trophies. Dortmund are still able to compete in the top four even though many of their talented players have been sold, but they will have difficulty winning trophies because their level is still below Bayern Munich or Leverkusen who have just won the Bundesliga for the first time in their history.