FYI, the author, Coral Hart, offers sales figures, but:
"Ms. Hart has become an A.I. evangelist. Through her author-coaching business, Plot Prose, she’s taught more than 1,600 people how to produce a novel with artificial intelligence, she said. She’s rolling out her proprietary A.I. writing program, which can generate a book based on an outline in less than an hour, and costs between $80 and $250 a month."
Also:
"It’s impossible to gauge how many romance novels are produced with artificial intelligence. Many authors don’t reveal they use chatbots, for fear of alienating readers. (A survey of more than 1,200 authors across genres showed that about a third were using generative A.I. for plotting, outlining or writing, and the majority said they did not disclose their A.I. use to readers, according to BookBub, a book discovery site that released the poll last May.) Even some authors who publicly oppose the technology are secretly signing up for Ms. Hart’s classes, she said.
The rapid incursion of A.I. generated stories is rattling some in the romance business. Publishers and authors worry that books by real writers are getting lost in the sea of digital slop, as A.I.-enabled novels flood the market."