I read an article about executive directors salaries at non-profits, and the gist of it was that good executive directors are expensive because they bring more

I read an article about executive directors salaries at non-profits, and the gist of it was that good executive directors are expensive because they bring more money into the org; would you rather 90% of $1m go towards your cause, or 50% of $10m? This doesn't seem to be the case with Mozilla, though. They somehow have the worst of both worlds: inflated executive salaries and a loss in revenue.