Normally football is a way of making money which I believe each club will find a way of getting profit from it, club that are at the top like Bayern Munich that always win their Bundesliga title, they can be blamed because they no the path, maybe they notice selling of players is most than trophy.
And sometimes it is also difficult for us to understand how other people do business in this case because selling players is also part of business apart from strengthening a team. And every team obviously always has their own way of trying to achieve what they want, especially in terms of trophies and after that is in buying players who they think can be good enough to strengthen the team's strength. So this must be seen more broadly because a team must have its own targets.
Every club has its own way of managing its team, they know what to do especially in business to get profits and one of them as usual they utilize from player sales. We can see how Dortmund now, they are always consistent in their business, have the ability to form players who were originally ordinary to be extraordinary then they will sell them at fantastic prices even to their own rivals.
But in my opinion in general they also cannot if they continue to focus on the benefits of selling players, because obviously if it is done very often then maybe they will find it difficult to balance the team's performance in each competition because they are busy with taking care of the entry and exit of players, and also of course adaptation which is a serious problem when they are struggling to win trophies or other victories.