Games like Earthdawn suggest it and even reward the party for having journals like that. There's a library in Barsaive (in the dwarf kingdom of Throal*) that once a year takes in journals from adventurers, and pays for them. And there's also the big Legend Points (exp) award for that.
* I was just thinking, even though Thera blew up, Throal might still be around, buried under tons of rock. Maybe even the Grand Library of Thoral exists still. And you can find tomes on Horrors, Namegivers, magic, and such there. And of course recreate most of the Fourth World languages.