Ugh. Attempting to force me to subscribe to a youtube channel or do anything "social" before I can view a video is repulsive, and will guarantee that I will not give that artist any of my attention or money.
Base your business model on that if you want, but recognize that you are offending some potential viewers / eyeballs (obviously, your customers are the celebrities paying you, not the fans). I hope you track the viewers who make it to the "you have to sign up/like/friend/follow/etc" page and go no further, AND make those numbers available to your customers so they can see how many (possible) fans their desire to use that "feature" is turning away.