It's kind of a weird complaint. I've written longer stories. Where were all the shorter story complainers then? Not to be found. Somehow, there has to be a happy medium.
As it is, I'm pretty sure mine are among the shortest here. So far, they've been nice complaints, like, "Oh! I was just getting into this when it ended," or, "That's it?! I want to know what happens to so and so."
Can't blame people really. Maybe they would like to pick up the story and continue it. :)
Oh yeah, I don't get many LEGIT complaints. But one person was really ticked when I ONLY added a five minute freewrite to an intense story. I don't think I've ever heard from him again!
Generally I lose people when I write long serial stories (like over weeks) but I REALLY want to get back into writing actual book length stories and publishing them for some income, so I hope people who like longer stories stick around :)