Kidney & Urology Foundation of America is a great example:
Total Overhead: 91.9%
Management & General Expenses: 38.8%
Fundraising Expenses: 53.1%
CEO Compensation: $132,642 (31.7% of revenue)
While some of those extreme cases may be problematic, I think that there is a risk of putting too much weight on administrative cost ratio (with low ratios being "good") as a metric.
Its easy to reduce administrative costs by simply not putting effort into making sure that the way funds are spent is effective at achieving the nominal goals of the organization, but I don't think anyone who thinks things through would think that makes a charity "better". You need better metrics to answer questions of charity quality.
Software shops that don't invest in any of these things end up producing crap. Software shops that over-invest in these things end up navel gazing instead of getting shit done.
The line between reasonable and unreasonable will shift from context to context and from organization to organization. There's no silver bullet or magic metric.
Ditto for charities. Running a survey that costs more than your actual charity work in order to determine if some strategy is working might be a complete waste of resources. But it might also make a lot of sense. E.g., before dumping 10x the initial investment into that strategy, or before convincing 5 other large charitable organizations to double down on the new strategy. But sometimes it's the tail wagging the dog and/or a failure of leadership. It's impossible to tell from dollar amounts alone.
No universal one that crosses different missions, sure.
OTOH, if you can quantify progress in achieving an organization's mission, you can create a mission-specific measure of effectiveness with which dollars are spent. (And if you have competing organizations with similar missions, you can use such a metric to compare them, though obviously that doesn't extend to comparing charities with different missions unless you can also quantify the relative value of the missions.)
If the a non-profit organization is the size and complexity of the US government, than a salary equal to the salary of the Chief Executive of the US government is quite appropriate, sure.
They do? All of them or just some?
I feel like it's more likely that the same people would have issues with the university abuse too.