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I think because they are also experiencing financial problems like clubs in Serie A, and on the other hand buying young players and selling them at higher prices is a business one of the ways for them to stay in the Bundesliga. It is possible that Dortmund will change the direction of its policies if the Club is owned by Middle Easterners like Man City and Newcastle in the EPL.
It is also true if someone says that Dortmund is a springboard club, that is indeed a fact that we can see today. There are lots of star players from them Jude Bellingham, Haaland, Sancho are players who were raised by Dortmund. There used to be Kagawa who was released to Man United during the Ferguson era to replace Park Ji Sung who was also an Asian player. One thing is for sure that not many clubs have the courage to give trust and play regularly in the main squad to young players. I think this is one of the reciprocal relationships between players and clubs to share benefits.
This is a strange situation for both the clubs and the players. Because it is not easy to give one party all the blame. The players do not want to stay in a club that is not going to be the best in terms of achievement. At the same time, the club also wants to earn some money by selling the players. Because after all, it is a business.
So I don’t think we can say that the club should always keep players that they produce all the time. But at the same time, they should not sell the players that are probably playing the best for them, especially to their biggest opponent. Trust is not going to be there between the players and the club, if the club does not give the players any confidence that they are actually going to win any trophies.