Im all for fun menace - hell, my name is Dennis! I think that Andy and the Mods may have even created the off topic section for people like me!
The longer Ive been a member here, the more I agree with the policies. Sometimes remarks that are off topic (and Im still guilty of that from time to time) can really confuse the flow of a topic. I think the Mods are very tolerant, and only draw people back to the topic at hand, if the topic goes off topic, for too long or in a big way.
When it comes to the for sale threads, were very lucky to have a freely available service that, lets face it, has better results than any paid ad you could put anywhere else. If you paid for an ad would you be happy if someone graffitid it? I dont think so.
I did read your post in that particular for sale thread, and yes, I thought it was funny. However, I also thought the seller could easily take offense at the remarks - it wouldnt be hard to do.
Its easier to have a rule for everyone and stick to it. That to me, seems much more fair than letting one thing slide and clamping down on another.
The off topic section allows us to pretty much speak on any topic we desire. I think we should keep it that way.