Woodward must regret saying "We can do things in the market that other clubs can only dream of!" a few years ago.
Such a stupid thing to say, gives selling clubs leverage. (No way would Dortmund ask any other club for £100m. They'd let Bayern have him for a cheese toastie, even if Bayern forgot the cheese) - but we never get a big deal done until the very brow of the transfer window.
Bayern got 3 players from BVB:
1. Lewandowski - probably (no proof, but a lot of signs show in this direction) had a "contract" with Bayern 2 years even before the contract with Dortmund ended. For example Kucharski and Co. already celebrating Bayerns CL victory vs Dortmund in Bayerns lounge -> nothing BVB could have done
2. Götze - bought with the help of a release clause -> nothing BVB could have done
3. Hummels - was sold for 35 Mio, which at that day was a big, big transfer fee for a fullback with 1 year left on the contract. Additionally Hummels asked for BVBs support in this matter, because his wife wanted to migrate to Munich with their unborn child
BVB did not have the financial power at that time, being nearly bankrupt in 2005, to fight against the transfers of Lewandowski and Götze.
I think the times that players from BVB go to Bayern for peanuts are very much over. BVB has grown enormously in finances and can nearly match the big wages in Europe.
BVB and Bayern have a big rivalry, because Bayern bullied (bullied = used their financial power as the leagues undisputed No 1) BVB to give up 3 of their star players when they were a very small and fragile flower. I'd rather give Sancho to Utd for 80 Mio then getting 120 from Bayern, but that might be just me.
So I hope I can help to get rid of this myth that BVB gives away players to Bayern basically for free. Because it is no longer true.