Never. It's some sort of humble bragging fad I never understood. One thing to note: everybody who donates money anywhere is basically paying for shit anonymously.
How often do you rage at daily stupid difficulties created by people, which shouldn't be created?
How often do you go some store, get distracted and forget wtf you went there for a few minutes, so you strategically walked in the middle of all isles glancing at each isle, to jog your memory?