Heads up, Creators: On Dec 13-14 you may see a noticeable decrease in your sub count as we remove spam subscriptions. If spam is removed, you'll see a YouTube Studio alert: https://goo.gl/qGDBvX This should help give you confidence that the subs you do have are real fans!
I am subscribed to several channels I never watch, but use the subscription/notification feature to let my kids know when their favorite Youtubers have published a new video. They are too young to have accounts so they watch without signing in when I tell them about a new video