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.