If I have a clearly conveyed vested interest already in making you believe I'm fictional, doesn't that superimpose me between the two states of real and fictional? I might as well jot down all the things I get out of you believing I'm a fictional character.
1 - I get to skirt around worrying about a parasocial relationship because you get a clear picture of my philosophy regarding all that. No matter how genuine I appear you're building a person in your head from piecemeal and that's perfectly fine so long as you accept that's the case.
2 - I get plausible deniability from anything that I say here because I have the excuse of operating with artistic license in a fictional setting. Sounds a little Machievelian but I've got to stay safe somehow.
3 - I get you to experience a simulated microcosm of the confusion I feel on a day to day basis. Frankly I'm really agitated by my life and I want the people who don't help me to feel the way that I do. It's not pretty when I state it plainly but it is what it is. I don't exactly hate all of you but I consider it poetic justice to make you all as confused as me for reveling in all of this.
4 - I get bonus immersion from people reading my short stories.
5 - I get people experiencing all the things that I've made already on the pretense that they're playing some game. Is it exactly one big marketing stunt? No. Is it a nice little cherry on top? Yes.
Now I hope you understand exactly how much I'm getting out of all of this. If I were a fictional character inspired by reality for instance I'd have a vested interest in making myself appear real through this with reverse psychology. I may simply be a fictional character who believes the life I lead to be true. Can you assume authorial intent?