This whole myth that Bayern are good purchasers of expensive talent is not based on any shred of reality. Bayern have done a sickeningly good job at building their squad for super cheap, with almost everyone being developed in house or purchased for pennies in the current market. But when they spend more than 25-20 million its like they are just blindfolded throwing darts.
Their last big purchase, Tolisso, cost them 37 million and has played 1600 minutes in the league. While this season was due to an injury, he didnt play that much last season. Gotze was an expensive flop, as was Benatia, Renato Sanches.
For the ones that werent total flops, Douglas Costa they basically broke even on, selling him after 3 seasons, and Thiago and Javi Martinez have been in and out of the lineup for years. Basically not a single one of their high priced purchases has turned out to be THE guy at a position, while 50% have been flops, with the others being mostly squad players getting 1500 minutes a season. Bayern are a top team not because they make great purchases, but because they have financial backing where they can afford to make stupid ones and eat it.