That being a Mark Twain quote was apparently just a made-up thing that circulated on social media. According to Twain experts, he never said anything of the sort.

https://www.reuters.com/article/fact-check/quote-comparing-politicians-and-diapers-falsely-attributed-to-mark-twain-idUSL1N2P21VE/

Apparently they have a saying in Moldova, goes something like “you should change your underwear and your politicians frequently, and for the same reason.”

This is more of a system issue than bad behavior of an individual charity.

Charities can underpay a little bit, because working for a charity has its own appeal. But if you want a talented, experienced person to run your org, you have to consider what they could make if they worked for someone else. San Diego is not a cheap city, and has its fair share of CEO positions.

If you really want to stretch your dollar though, local food banks are probably a better bet.