Yea, I wouldn't expect to make all the profits. In fact, what I "could" do is go ahead and build out a template of the site (pictures, graphics, etc...) and buy the domain name. Then contact a company and find out if they want to go ahead and purchase the idea and domain from me.
My idea is an interracial site but there is a genre too it just like you see with sites like Biggest Dick in Porn, BOB, and Spring Thomas where white girls are banging black dicks.
But I think the idea I have is very creative and definitly plays into the idea of what you see from those companies.
So I guess that would be my goal, to buy the domain, build out at least a template of the site and contact someone like BOB, BDIP, SpringThomas, or any of the other ones and see if they would be interested in buying it from me.