There are so many tubes site now you would have to have a really good niche idea and a great way to promote it and get traffic to it otherwise it would be a fail.
You could try list it on nichepornsites.com
We have move to sites like that even as a way to earn as even tubes sites with traffic only make so much $'s.
It is almost like shitty 3rd world countries use vpn's so any US traffic mostly isn't US
ha