I'm with Fret on this. If an author wants his work published, there are lots of venues available for him. (prohibited L), Wren Spot, Fictionmania, Erotic Mind Control Story Archive, Transformation story archive, and even the smaller sites like Cheviot's Place publish stories, or have places to publish stories. And those sites currently can provide a decent reader base for a (smut) writer's stories.
Frankly, I don't really think your idea of a site where authors can "self publish" is any better or convenient than the current methods. If anything, it's a set-up for an even lower quality of stories. At least the current sites will (hopefully) get a one-time screening from the site owners before being posted. A self-posted story site might turn up the same level of quality as the Addventure. Not to knock the Addventure, but isn't one of that level of the medium enough?
It seems to me the only thing Mark T's site has to offer, that the other sites don't, is higher quality, expanded readership, the best-seller's list, and (recently) the ability for readers to rate the stories. What can your proposed idea offer that would be more appealing than this?
The only sensible answer would be if this proposed site were ON the BEArchive itself. Only then would it have even a glimmer of hope of surviving, because of the high number of people who visit this site every day. So, your real problem, it seems, is not a lack of stories, but the inconvenience of not having them here, on the BEArchive.
Perhaps if you yourself had a means of creating such a system (being able to post stories), you could do it and present your idea to the owner, with yourself as the site leader. That's what the BEArchive is for, after all. Otherwise, I'd say that your idea won't go very far.
In short, what you're proposing still would take a lot of HARD WORK from SOMEBODY, and if you aren't volunteering to actually write the code and server scripts for this author-publishing system you're talking about, then who's going to do it?
In the end, it's far easier just to set up a site where people send you stories and you, the owner of the site, publish them as you get them. But like I (and Fret) said, there's already a LOT of sites out there like that already. The only real problem left is that you aren't going to be doing 100% of your reading here at the BEArhive. I don't think there are that many people out there who have as big of problem with it as you do...