I like discussing this matter but even tough you are right about some things, these rules are commonly used in almost every popular forum you can find.
As these forums might get more crowdy, it is better to keep every subject tied to one thread. Of course you can talk about a golden chief helm being bugged, and about being too expensive in diffirent threads. But at least take a look around before starting a new thread. As in most threads I've seen, the subject was a direct copy of other topics. Let me give you an example:
1. 2. 3. 4.
As all the posters above immediately started a thread, they could've used the search button to find the
actual answer to the problem...
Also, when I'm following a thread about sneak attack for example. I would like to know what others think of it, or what the admin is going to change about it. When new threads with thesame subject are being posted, the admin might give his information there. Thats when I find myself looking at the wrong thread while its actually the first one created.