Here is how most publishing companies get started: somebody writes one book, manages to get it onto Amazon, enjoys the feeling enormously — and decides that this is now a business they run.
They are not villains. They are usually lovely. But their entire body of professional knowledge is one book, in one genre, in one market, at one moment in time, and they will now confidently apply that single data point to your book. That is why so much author advice sounds strangely absolute. Always price at 2.99. Never do print. You must have a series. What they mean is it worked once, for them, in 2019.
The tell is what happens when you ask a question slightly outside their one experience. A real publishing background sounds boring in comparison — metadata, category strategy, distribution channels, retail timing, why the cover has to be legible at the size of a postage stamp. It's unglamorous, and it's the part that decides whether anybody ever finds the book.
I came in the other direction. I learned the industry from inside it, learned audience-building from inside advertising, and only then started publishing my own work. Which means when I tell you something about your book, it isn't extrapolated from my one launch. It's from a couple of decades of watching what actually moves.