I mean when I was a child I learned a lot. Excusing for a moment that most of what I learned was, at best, a layman interpretation of some works of fiction, I did learn things. By the time I was 14 or 15, though, there wasn't much to learn at meetings anymore. I can't see how anyone can claim to learn anything at meetings if they're an adult that was raised in the cult - the only time you learn anything new at that point is when they issue some "new light." So maybe 3-4 times a year.
Maybe some people just have trouble remembering things, so when they hear it for the 40th time it still sounds new?