That's a masterly summary, Buzzb. I was considering answering the question but wouldn't have put it nearly as succinctly as you have.
If there's one unifying theme among the many posts about the Listener threads, it's that the great majority do NOT want to see the theme given away directly. I have also corresponded with a few setters who all say that they are fine with people being given a gentle nudge to get over the line, but not with the theme itself being given away explicitly. That's pretty much what happens anyway. It's inevitable there will be transgressions from time to time (I'm sure I've done it myself), but the report button is there for a reason and permanent offenders can be prevented from posting if necessary.
One setter did tell me that "cute" posts (such as "it's all Greek to me" on a puzzle themed around the Greek alphabet) are extremely annoying to setters and perhaps we should discourage that sort of thing.
This all reared its ugly head again because Norah went the extra mile to accommodate a contributor who behaved in an obnoxious way, and although he's been banned I have a feeling he's enjoying reading the mayhem he's caused.
As for the submission of the solution: I also hope that nobody who comes here for help enters the prize draw/statistics record.I suspect most, if all, don't, but obviously it's unenforceable and it's a matter for individual conscience. I may be wrong about this, but didn't Answerbank ban hints on the Listener because at least one person boasted about using it to get a 100% record? It would be a shame if that had to happen here.
Here endeth the lesson.