That's the truth EmpireAutoPilot
But sometimes you don't even need traffic if your niche is hot and very focused.
Look at tony404 Mandy Blakes' site is very successful. He doesn't even have an affiliate program...though he does invite a handful of people to promote her. He doesn't really need affiliates. He has the product. BBW lovers WILL find what they like. Sometimes I wonder if it's a little like searching on Ebay for something. They seem to find Mandy Blake no matter what.
Same thing with big tits. Claudia-Marie had a thousand members in the first couple of months we opened the doors last year. And she wasn't in the adult business in any way at all until we did that. Not even as a dancer.
The afficiandos of these niches search high and low for what they like. We acheived success right out of the door by me sending a little traffic and then literally word of mouth spreading over big tit forums and chat rooms almost overnight.
Now if you open a paysite with a bunch of content you bought feauturing the porn valley girls getting fucked by the porn valley guys, it's gonna be a lot tougher sale. There can be a niche there but not a specific focused thing.
In that case it better be a great idea and theme and you better have a LOT of really good affiliates sending traffic.