IMO, I think Legion M's money is best spent on targeted ads. I've spoken with lots of people who just don't get (or don't care about) the brilliance of the Legion M business model. People who seem to have the best potential for "getting" the concept are fans of genre movies, or art house films, or are in the industry. I'd like to see Legion M continue to target groups like that, rather than a more general audience.
Another reason to keep the targeting small is that they don't really have the manpower to address all the questions and comments that would be generated by a big push. I helped respond to comments on the FB ads during the last round (they bought several FB ads directed at the groups I mentioned above), and it was extremely time-consuming to give thoughtful and informative responses to all the questions.
As for YouTube advertising, some browsers have extensions that block the ads, so a lot of people would never see them. Rather than buying ads, we'd get more bang for the buck if Jeff and Paul could be guests on the shows -- and not just once, but when we have a new round opening, or a major movie premiering, or a big event like the Stan Lee imprint ceremony. Several members have said that they think promoting our involvement in popular projects (e.g., Bad Samaritan) will get us more notice than trying to sell people on an investment in an unknown start-up.