@lorenipsum Honestly, it would probably only take a few instances of people publicly doing it and gamifying it during their talks to catch on.
"And we all understand how critical little pieces are... Yup, that XKCD comic. I used it, so I'm going to donate $10 to $SomeProjectIUseOften. Everyone in the audience, I encourage you to do the same. CC $CustomEmailAddress your receipt, and we'll share the results at the end of the talk!"