There is a market out there for anything. Out of all of the niches that you listed, I think the hairy would do the best.

From what I see on the VOD end of things...
Some of the videos that you look at it and just think to yourself ...

-This will never sell.. Who in the world is going to want to watch some grey haired 75 year old fat hairy goblin looking midget fuck a granny tranny...

And 2 days later there it is in the top 5 movies people are watching...
Call it curiosity..
Call it a train wreck..
Call it money..

Content of "real" people outsells the "hot" skinny airbrushed girls every time. I know it sounds crazy...but you can sell an average girl faster than a Puma Swede. And yes, I know you'd FUCK Puma over the average girl. But I'm talking sales. My experience says that guys who search for the girls that we all would agree are really hot, are not the guys who spend money. But the guys looking for something a little more specific are more willing to pay for it. They can see the Pumas, and Penny Flames, and Trisha's all over the internet for free. But to find some real amateur stuff isn't as easy. So yeah, there is a niche even for real ugly stuff. That is even rarer.

Yeah we also run a couple whitelabel pay per downlad sites with local billing and the gross looking couples are also the most downloaded.

Exactly, point taken.

There is. Privatamateure.com for example provides such content. It´s not ugly models only, but ugly models mixed among others.