I hate that too, which is why I always resisted positng my serials a chapter at time,but waited until the whole damn thing was finished before hitting the SEND button.
There was this one erotic story from long ago that I was really enjoying. There were six chapters, and each one was to be continued into the next. Thing is, at the end of the six one, it read "To be concluded" but the writer never got around to writing that last chapter.
After about a year, I actually decided to write a "conclusion" to the story myself. Wasn't as long as the first six chapters. Didn't submit it or anything either. Just wanted to write it so as to bring an end to the story arc in my mind. Still, it would of been great to read the authors own version of the end.