Also the fact that people involved are Lords, Ladies etc is irrelevant. I did some pro-bono work for Marie Curie Cancer Care back when Sir Tom Hughes-Hallett was chairman, and he was as passionate about the charity as everyone else I came across despite the fact that his huge wealth meant he could easily have retired and done nothing for the rest of his life. His connections in The City and beyond meant he was able to attract publicity and support from other wealthy and well connected people.
The fact that people who work for are well paid seems to get so much attention, but at the end of the day it's a business (albeit one with different objectives and mission statement) and so they need to be able to compete at least someway with the private sector to attract talent in order to survive in what is an extremely competitive charitable sector.