Do you work for free?
I would gladly work for free to help the folks who will fly into harm's way in the future.
I joined the US Air Force because I needed work. I found a family. And I don't charge family to do the things that help keep them alive.
I don't fault O'Grady for charging to speak to universities or most anywhere else. I fault him for wanting money to help teach those who follow how to stay alive if shot down.