If it didn't have a utility in taking the shelf space they wouldn't bother making them as it'd be a net loss. If it's not a net loss, people must be finding value such products being there as that's where they are choosing to buy them. That could be anything from gifting to collecting to lack of awareness otherwise, but it doesn't really matter what - there's no inherently shit reason for a product to be on the shelf other than if it actually doesn't have demand in that form.