There is another possibility. And please this isn't me being negative, just throwing out things for people to think about.
Ruseful might be fishing for people to add content to there's and others Tubes to boost the content library.
Maybe if some sponsors submit and see how the traffic rolls. Then report back here so we can get a selection of results with different content. We can all compare the results. I have some unique exclusive content that's not all over the Internet, I would think after 3 decades I know how to edit to entice the viewer to want more. So Ruseful, can I test some content on your tubes? The videos will not get mass appeal, yet with so little around of what my
Retro Porn site has, I'm sure it will get the viewers who like this content interested.
Personally I think something like 95% will fall into this trap.
"Especially given there are hundreds if not tens of thousands of videos within the same niche or content type available for free right there on the same tube only a click or two away."
Why would anyone join a site with the sort of porn that's the same or similar, as 100 other sites and also on free sites?