Sites like literotica and ASSTR.ORG tend to take away greatly from the marketplace. It is very hard to sell stories when there are well known places that give 20,000 plus stories away.
I have done well in the past with
Stories Traffic run by someone who has been in this business since just about day 1. Niche markets work :-)
The other choice is to use the stories to upsell people to video and other sites. It all depends on the approach.
Traffic is hard to find, tends to be loyal, and tends not to buy, so it's a challenge. I have a fair number of stories sites, and I rarely build new ones anymore.
Alex