I enthusiastically pay money to Pinboard every year to maintain a snapshot of every page I've bookmarked (6,280 to date). I don't like trying to reference or look up something that's a few months or years old and not being able to find a current copy of it anywhere. The Internet Archive sometimes helps here, sometimes doesn't, depending on the individual site.

Pinning other people's pages that I've read seems like a reasonable way to scratch the same itch.