Dr. MacDonald has an impeccable storytelling resume. That doesn't give her the right to use her keynote address to scold the very organization that invited her to speak.
(She was chiding the National Storytelling Network for charging too much money for international memberships.)
Heck, they charge too much for domestic memberships.
It was appropriate in the context of her speech (an overview of international revivalist storytelling, and the challenges and opportunities for collaboration in U.S. storytelling events) to raise the issue, but why not be diplomatic about it?