The fortunate thing is that Bayern's advantage financially isn't that much stronger than Juventus today. Bayern generated 507 million euro in revenue, and 111 million in EBITDA. (July 2015 figures, most recent). Juventus generated 390 million euro, and 110 million in EBITDA. The key is that Bayern's cost structure in general is higher, and furthermore, Juventus has historically spent less on the transfers in recent years, which actually puts Juventus' operating income ahead of Bayern. That being said it isn't completely apples to apples, because Bayern likely grew a bit from the trailing last twelve months from July 2015 to December 2015.
Juventus also does have some debt on the balance sheet, while Bayern has none. Juventus only spends 5.4 million in interest though. Bayern spends 3 million apparently without debt, so it makes me question whether some of the liabilities are indeed debt, but Bayern doesn't disclose.
The key is that functionally, with existing cost structures, Bayern can't "beat" Juventus easily in bidding wars because both teams are generally good with their cheque-books and won't pull Manchester City-esque moves.
As I have said before, with potential sales, and the financial growth of Juventus, we could see a very healthy transfer season. Leverage is low, and EBITDA is at record levels...