Agree with you that winning trophies is not a priority for Dortmund, recruiting young talents with lower market value is their specialty and then selling them at high prices, this will give Dormund a big advantage. What doesn't make sense to me the most is that they like to sell their players to rival clubs like Munchen. You can imagine how disappointed their fans were to see the direction of the club's policy with such a business style.
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We wouldn't have seen Borussia Dortmund fight to the end if they didn't prioritize the Bundesliga last season, the fact that every team include Dortmund has an above average desire to win the Bundesliga trophy after so long. By winning the league they will find it easier to benefit from various sides such as sponsorship, increase the market value of the players register in it, and so on.
Yes indeed, one of the ways that might work for Dortmund to win the Bundesliga trophy of course, it seems only enough to keep the main players from leaving. In this way, at least Dortmund will have a better chance of being consistently at the top of the Bundesliga standings until the end. But yes, because maybe Dortmund already have standards in managing their club, it seems it will be difficult for Dortmund to retain key players they has. Because of course, when the player is in demand by another club and the club is willing to pay expensive, then maybe Dortmund will no longer be able to keep the player and are ready to let him go.