Realistically, I don't think anyone will be spending hours here instead of reading real fiction anytime soon (I personally wouldn't). There's just so much nuanced complexity when it comes to creative writing as a domain (long-form outputs, creativity, etc.) that coming up with better annotation methods has massive applications in other research, like in scientific discovery. "AI Wattpad" just happens to be a convenient form factor for crowdsourcing from an HCI perspective. I hope you give it a chance.
OK, so you already recognize these stories aren't something that people are going to spend time sorting through. How could you possibly then get any usable preference data out of this?