And if so, what kinds of short stories tend to be most successful in this regard?

You're looking at this space from the wrong angle.

Getting sales is a function of your visibility on marketplaces that are overwhelmed with minimum-effort works.

The problem you need to solve is not "how can 5 days work be done in 5 minutes", but how to stand out amongst the million other people ahead of you on this.

There are already millions of short stories on fanfic community sites like Wattpad, and that was before AI gave people a way to mass-commoditize content. So that should answer your question.

You cannot make money from writing shorts.

Would you read AI written short stories?

If it's not worth your time to write, then it's not worth anyone's time to read. That leaves only AI crawlers, and last time I checked they don't pay anyone for anything.

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