They actually only spend about 20% of their revenues on breast cancer research. They spend a lot of their money, about 40% of revenue, on "awareness companies" which have dubious real-world effectiveness, and can be considered a clever way for them to market themselves and fundraise without actually having to report it as such (they spend 10% on fundraising to begin with).

They're also very litigious. Of course they need to protect their brand, but in a lot of cases they are pretty objectively the bad guys. They have taken legal action against other orgs/charities using "for the cure" in their names, they've taken action against orgs/charities using "cure" and pink together.

In general I think they are more focused on self-perpetuation than curing cancer. There's a lot of reading material on how some of their corporate partnerships have been deceptive in the sense that Susan G Komen received very little directly financially, and took the opportunity as a chance to market themselves instead.

Their CEO and upper management do make a lot of money, but I don't think it's out of line for an organization their size. It's still a matter of controversy though.