I knew someone who did the Susan G. Komen walk, the 60 mile 3 day walk. It was a friend of the family. She walked and got sponsors and pledges. But, the people at Komen required walkers to donate a certain amount, and if they couldn’t raise the money from sponsors, they required the walkers to make up the difference in donations.
I can’t speak to whatever else Komen does with the money, but, they do seem focused on maximizing the money flow, even to the point of compelling the walkers/supporters to give more from their own pockets
My sister-in-law was diagnosed with aggressive breast cancer. Her husband, my brother, who makes his living at research, discovered that Komen does not support research, just examinations or something. I have no idea where all that money goes/went. But I do know that my brother is violently anti-Komen.