I'd like to challenge this narrative somewhat, why do people care about what teens like exactly? I've heard for years (EDIT: decades, as long as I have been ali

I'd like to challenge this narrative somewhat, why do people care about what teens like exactly? I've heard for years (EDIT: decades, as long as I have been alive) teens are a "coveted demographic," but teenagers, especially today hardly have any disposable income. Why is some sense of "popularity" valuable, which is somehow valuable enough to be its own category apart from sales, a quantity that I thought would be much more important. Wouldn't being popular amongst people who actually buy your things more important? iPhones are definitely popular, but they are profitable not just because they are popular, but that they are popular at the price point they are.