I wouldn’t discount YouTube based on that experience. That channel looks to be one of the channels that drives a lot of views through children, specifically, children watch and watch and watch these videos on TVs (driving up the viewcounts) but aren’t engaged, they aren’t going to convert to customers. You may wish to try more targeted channels, i.e channels with an engaged audience of people who like Japanese culture. A video with 1,000 views to people who are enamoured with Japanese culture will perform significantly better than that video.