I hope other people can donate to the library, because I use it a lot. But I can't. I'd like to see Neil Gaiman read, but I've already used that $5 for medication. I'm still getting used to not having enough cash on hand to casually agree to going for coffee or lunch, but so far my generous friends have understood when I've asked them to buy, even after the fact. That's the hardest part: remembering I have to say 'no' or request charity for valued social interactions.
But it's nice to just automatically ignore advertising and solicitations as not-for-me. If I don't have to mentally acknowledge it, it's easier to be grateful what I have without feeling deprived.