I just do not think that you can compare that business model to Bayern's owners - even if some would like to do so and often do. Bayern has multiple big sponsors, not just Allianz, Audi or Adidas - and all 3 named companies with minority shares and are companies that are fully traded on the stock market - they are responsible to their multiple owners, too, and have comparable sponsoring contracts with other football clubs. It is just not comparable.
It is different to e.g. clubs in Germany like Wolfsburg or Leverkusen that are sponsored to a big part from their parent companies Bayer and Volkswagen.
Bayern's financial success - so not having much debt from the stadium helps - can be mainly explained with the conservative way Bayern does their business and the special situation they have because of their sportal situation in the country - their main competitor for sponsoring contracts aren't the other clubs but the national team. Maybe it helps a lot, too, when you have had a stable team with constant success in the recent seasons, too - without having to blow masses of money (compared to others) into the squad. And the relatively cheap replacement of the former star players.
https://www.transfermarkt.de/transf...&nat=&pos=&altersklasse=&w_s=&leihe=&intern=0
And that talk about Bayern's cheap buys from other German clubs is bullocks. Look at the starting eleven and when/how they got the players and there qualities then. The only ones that were stars when they bought them were Lewy and Neuer - that is more than 6 years ago - and both weren't that full developed professionals then as they are now. Most have made some steps since they came to Bayern and weren't fully developed.