Sacha writes

This 'what proportion' thing is always difficult. On the one hand a
charity does have admin costs and some would say that professional fund
raisers justify their salaries because of the contacts and professional
approach they bring to such things.

Snip

The awful thing in terms of decisions is how many charities there are
needing and deserving support - the leaflets just pour into the mail at this
time of year.

Which is of course exactly why charities need their professional fund
raisers. They can no longer rely on it being 'a good cause' - they're
competing with all the other good causes. And that requires being able
to hire good publicisers.
--
Kay