It is also worth noting that we rarely, if ever, laugh at a seller for posting something for too little. Indeed, many of us boast about free (or dirt cheap) hauls. And, well, when you put 1 and 1 together to get 0 it just makes us sound like a bunch of freeloaders.

That being said, I don't like the rule. While you can regulate behaviours, it will not change attitudes. So we will just see that sort of behaviour manifest itself in other proliferating threads of discussion. (Remember when the problem was Mac vs. PC. Then it was bitching about sellers. What's next?)