Though I don't specifically have a favored outlook either way on off topic posts... I will admit I am guilty of it... But I will also say the way the site is now is a major reason why I frequent this forum soo much, and more so than other forums.... I feel most forums that target the issue of being off topic are too unbecoming... some try way too hard, most drive away people, and it's really all for not...
I understand the clutter can be bothersome... but is it really that unbearable?, most all off topic convos are funny, or still have some relevance to the original post, and it isn't really that hard to weed out the good from the rift raft off topic comments...after all no one is forcing you to read it...
I will say that I feel off topic posts in sales should be moderated, just for the seller/buyers courtesy....
I think as long as it doesn't wander too far off from what the op orginally wanted its ok. Sometimes the off topic discussions leads to other solutions which the OP may have never considerd before.
+1 Well said.