In an author-related peeve, I've been reading a lot of self-published mystery series and they're so much alike I almost think it's one person writing under 15 different pen names. They're around 200 pages and a new one comes out every 2-3 months. If the stories don't exactly end on a cliffhanger, it's close enough that the next one in the series picks up at the same place.
I don't claim to understand the economics, but the silly things only sell for around $3.99. I get them free with Kindle Unlimited. After publishing expenses, the authors must take home maybe $1.50 for each sale? I just looked up one of the more popular authors, and her latest release is #405,173 in book sales and #882 in Kindle. Nobody's making bank on those numbers.
It's throwaway entertainment for me but I still wish the authors would take time to plot out a complete story arc that ends with a danged crime being solved. Charge the standard $8.99 or whatever. It's not that a short story or novella can't be fun to read, but at least call it what it is.