Who knows? That is basically it. We dont know how the books sold so we cant say if customer impact was limited.
They dont share information on many things. Why was the imprint started? We dont know. Why was it stopped without any notice to the customers? We dont know.
Is there any plan for the Scouring and the releasing of books in the series? We dont know. Why , even if there are novels released, are they released out of the blue, and is there no sense of forthcoming books for customers to look forward to? We dont know. Why is even the annual BL preview cancelled? What happened to the BL Celebration? We dont know.
Could the Crime/horror imprint return? Seems unlikely but then their ways seem random.
As Felix mentions, their print runs are small so its unlikely to do with customers not buying enough but then again they will know what they sell a lot of, even if we dont.