Title is pretty self explanatory. I think threads tend to be closed based on personal opinions which should NOT be why the thread is closed.
I do not feel the need to post any real justification because in my eyes at least, it's pretty common sense to why you should not let your biases and opinions effect your judgement on matters such as these.
Example
http://osbot.org/forum/topic/4189-vip-too-expensive-imo/
(inb4 we closed this thread because we cannot afford to lower it etc, I don't see that stated in the thread; only if stated it is a valid reason to close the thread)
I should not have to be suggesting this.
On another smaller note (my original 'suggestion' ties in with this one:
If you lock a thread, justify why you have locked it so people do not get the wrong idea; if you care about what the community thinks how you run things then it should also be obvious to why this is important to an extent.
I may justify my reasoning later on if I can be bothered and if it is required.
Edit:
Rofl @ the title. Yeah, I'm p tired etc.