You might be overthinking it. If you take the stereotypes around gendered adult fantasy preferences and accordingly swap the stereotypical media for those preferences, you end up with something like:

- A Fifty Shades of Grey fan convention

- exclusive chapters distributed to fans but the chapters are secretly ghostwritten by the author's assistant.

Let's assume that there's no extrinsic value to the exchange - a signed photo, for example, can be resold for profit. If it's just *content* then the value is solely in the user's enjoyment of that content, so if the fanfiction-of-a-fanfiction is entertaining enough, it fufils its purpose and it doesn't matter who provides it.

When we go to Disneyland, when we buy a lottery ticket, we are exchanging money for the ephemeral enjoyment of a fantasy. This, surely, inhabits the same domain.

At Disneyland, there are networks of hidden tunnels so the cast members can maintain the illusion, but the deception only adds to the value.