I tend to lean towards this thinking as well.
There are many people in this thread and others across the internet and media who are talking about the conflict of interest. However, there's little showing what potentially bad things she is doing.
Yellen has lots of experience with the regulatory and finance institutions and their inner workings. For sharing her perspectives on how things work, what pressures they face, and how best to engage with them, she should be paid quite well. That's what these Citadel talks look like, at least until someone can connect the dots better than they have been connected.
For example, what nefarious plot is there? What regulator capture is she engaging in? Somewhere else in the thread someone mentioned car import issues with Reagan; where is the equivalent with Yellen?
Until there is a salient point to be made about her conflicts of interest, doesn't it make sense to give her the benefit of the doubt?