That's a ridiculous standard. How much money do you make? Do you live on the bare minimum necessary for survival and donate the rest? If you do, then kudos. If you're like most other people, you probably indulge in a luxury once in a while that you wouldn't otherwise buy if you couldn't afford it. That's not unreasonable. If your income unexpectedly declined, I'm sure there's a number of expenses that aren't strictly necessary and could be given up without too much worry.

FWIW, MMM did blog about giving away $100,000 of his blog windfall last year (https://www.mrmoneymustache.com/2016/10/26/notes-on-giving-a...) and plans to give away more.