I don't mean to sound condescending, but how old are you? I'm only in my late 20s, and even I don't consider myself the main target demographic for the app, but it has proven itself fairly useful for certain scenarios (e.g. something happened around X, was curious about quick videos from the area). There are people who read what you would consider "quality books", and share/talk about them on the app as well. Even a very small subset of users/likes transfer into an actual product purchase is a mind-boggling achievement for the writer, so we might be underselling its value.