This forum isn't a hobby for me, it's a means to an end.
There's nothing inherently wrong with a member spending hours sifting through every thread to find any possible opportunity to insert an opinion, try and make a witty remark, fulfill a need to be heard, or for validation or whatever.
Members use the forums in very different ways, and that's the way it should be IMO.
The flip side are the members that want to spend minimal time finding the info they're after or sifting through classifieds loading page after page of sales threads.
So over the years we settled on a couple of rules so that everyone is as happy as possible.
Of course all of this isn't a big deal, except when a conversation devolves into who can get in the last word while walking the thinnest of lines (usually learned through participating in lots of similar conversations) along the boundaries of "not nice" behavior that has to be moderated or met with consequences.
Breaking the sales thread rules happen to be one of the only situations I find particularly irritating, especially when a seller asks politely not to post, or when the motives are questionable.
Again, not really a big deal in the grand scheme of things, but I definitely think it's a good rule.
I suppose it's because as part of my job I see kids that derive immense pleasure from being a "scooch'a damenz" and it's childish and irritating.
Anyway, what brought me here was that I was literally at that moment thinking about the exact same thing the OP wrote when I saw the title of this thread.