It really has nothing to do with the traffic in and of itself, it has to do with the convergence of two rapidly maturing markets and the fact that the evolution of one of those markets, or submarket (adult) is determined largely by the evolution of the larger, broader, all encompassing market itself. IE, the interweb.
Regardless, the Content vs. Traffic debate needs to be put to bed forever because neither account for the true X-factor - User Experience.
Marketing, particularly lifestyle marketing, can be effectively utilized to alter the consumer's perception of their experience, but only to an extent because the user will ultimately develop his or her own opinion of the experience.
What's troubling is that 'interactivity', in the parlance of GFY, is automatically assumed to be defined as 'interaction between model and user'. Not only is that wrong, it serves as another example of how everyone is trying to catch the next big thing without ever understanding the elemental reasons of why that thing has shown to be successful in the first place. The correct definition of Interaction, in it's purest essence when applied to adult paysites, is a user experience in which the user interacts with something other than his schlong. In most circumstances, I'd even go so far as to say that doing a Mad-Lib is more 'interactive' than a generic 'live show. Here, I'll even test the theory?.
That was pretty fun.
Another thing about the Met-Art user generated galleries is that being able to make custom galleries and vote on the galleries of others not only gives MetArt members something to do, but it also creates a sense of community. Not just any type of community,though, but a community that's based almost entirely upon the opinions of one's peers. It gives people a chance to be popular.