You earn exactly $0 dollars for posting on any other social media site. If steemit were to earn you $0.01 it has already generated infinitely more for you then posting anywhere else. You can post your youtube videos here as you are the content creator, and allow for additional discourse between you and your viewers. They can also potentially earn a bit from commenting on your videos (which is not possible for them for making youtube comments). So yes, I would say steemit is worth it. At its very worst its no better than any other social media site, there is only upside to be found here.