A professor of mine declared that he would donate to NPR when he had money, is it a case where the loan debts from the students is sapping the monies that used to go to the non-profits?
There's often a "storytelling" kind of aspect too--take our artworks and stop being so fussy about them, tell a story that relates, etc. I haven't really seen that work in big numbers. E.g., The Metropolitan Museum of Art does tons of online storytelling, that gets small fractions of the traffic that goes to the Timeline of Art History and the Collections search and the online Exhibition components.
A couple other responses here mention a) millenials are struggling financially, and b) we're an aging population and the old man, he's got all the money. I think both are true. Lots of museums have experimented with low-cost memberships (Brooklyn Museum was a pioneer). But you can donate tiny amounts of money to NPR. Maybe it's a question of really meaning it when you say "every little bit counts."