Dortmund have made a lot of profit from selling their players. that is why until now, Dortmund is unshakeable. they do not need a rich owner, like the billionaires who come from Arabia. Dortmund has done a very good business, and we can see that there are many Dortmund players who have become stars. in this winter transfer window season or next summer transfer window, Dortmund will reap huge profits if their two players namely Jude Bellingam and Youssoufa Moukoko are released in the next transfer window and they will replace them with talented newcomers.
This is the business that Dortmund's management runs, because of that they don't rely too much on sponsors and selling match tickets. most importantly, Dortmund remains at the top level of the Bundesliga and always exists in the Champions League.
Almost every season Dortmund have made hugr profits in the transfer market selling their star players, in the last 5 years Dortmund have been team that consistently sells their players every season for over 100 million euros. Dortmund have adopted with business in football with regulation youth orbit and include them in regular position from tow until three years before becoming star player and have higher values transfer.
Still have two left star player and potential with huge profit for Dortmund in next window transfer, I sure Jude Bellingam and Youssoufa Moukoko are released with highest price more than 100 million euro, actually Jude Bellingham have waiting by many favorite team in Primer League from Liverpool, Manchester City until Manchester United want to get his sign.
Dortmund will really benefit from player transfers this season. But in my personal opinion, some new good players need to be added to their team. Because the condition of the team is not very good.