As any other subscription, it depends on your habits. I can pretty much subsist on entertainment, educational, political, podcast, and simply fluff content on Youtube without any other streaming service (because damn, what's the last TV show I really was excited to watch? the new King of the Hill Season a year ago?). $15 for that is fine, for now. But I'm eagerly keeping an eye out on another ship to jump to.
I'm not willing to pay $20 a month for watching like an hour or two of mediocre homemade content Google did not even produce.