Having worked with many instructors, who you'd think would be rather intelligent people eager for more knowledge, I noticed that the overwhelming majority were a bit lacking in the logic department, which caused a good number to be highly resistant to learning. Librarians and other types of curator are no different, they're really just organized, professional hoarders, but not necessarily any more eager to learn than the average person, despite maintaining repositories of knowledge. Also, expertise, interest, and enthusiasm in one niche doesn't always translate into a broad range of interests.