All else being equal, it seems to me that the best strategy would be to use Youtube and social media to attract people to the Watch - that way you grow the community, without the potential problems of fragmentation. When I say fragmentation, I don't necessarily mean that individuals will split up between the sites, but people are not likely to start posting three times as much over three sites, and therefore the amount of contributions on any one site will surely be diluted, at least until such time as the audience grows three-fold, which strikes me as a tall order.
However, I think what we have here is the desire by some of the team to put a semi-professional level of effort into the enterprise, and thus they would like some kind of remuneration. That probably does require some kind of split, as I suspect the majority here would be happier with more modest contributions, and keeping money out of it.