We need to remember that if they weren't well paid, they would go elsewhere to earn their salaries. Charities have to operate on a business model in order to compete and survive in the current climate. They also need offices premises, paid staff , including fund raisers. They don't operate out of a small cardboard box.
From the people I know, and from what I read on gransnet and elsewhere, that idea does not go down well, nad as Ihave said, amongst the people I know, they have reduced their charity giving accordingly.
The parable of the Good Samaritan - Jesus asks, which of the 3 people who passed the man, who was the neighbour?