For what little it's worth, I used to get some sales from shorts, but those dried up over time. When I first started, there was even a market for $0.99 short stories. But those titles have now sat for years without a sale, even though the longer books they're associated with still sell.
I think the problem is the overuse of discount pricing. When people can get whole novels for $0.99 (and sometimes even box sets), a $0.99 short doesn't seem like that much of a bargain.
That said, there's no harm, to quote the old phrase, in "running it up the flagpole and see who salutes." Put it up at a price that feels comfortable and see what happens. You can always use it as a reader magnet later if you aren't getting sales. You can even leave it up on Amazon, just in case it picks up a stray sale here or there later on. (The same shorts that do nothing for me in sales terms make great magnets. Interestingly, one of them that hasn't sold in years picked up four five-star ratings o Amazon, presumably all from people who picked it up as a magnet.)
I agree with Timothy, though--don't put it in KU. KU readers seem to much prefer authors who are all in. If they look and see that's the only piece in KU, they're less likely to bother at all. But wide readers, if they notice it, will probably be irked. Also, if it's in KU, that forces a slower pivot if you decide to use it as a magnet.
