The very first question that comes to mind is, what are you going to do different than
these guys? I don't know. I couldn't imagine myself creating a site with videos that are already on a bunch of other sites.
That said, if you were going to use videos found elsewhere, maybe you can get footage that can be edited? The reason why is so that you can maybe sell advertising spots before/after the footage. Keep in mind that I don't know if this infringes on any sort of copyright or whatever.
But maybe instead of using videos from youtube and other sites, maybe you can make them yourself? Or hire others to make them for you? They can be anything -- your own commercials, site reviews, training videos, interviews, news, comedy, etc, etc. The sky is the limit. I think having your own videos (assuming they're good) would make it much easier for you to market the site down the road.
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