Re: why?
In order to move posts, you need to be a moderator. No other way.
Threads usually get closed because the mods don't want you asking questions in the stickies, and like LAC_STS said, if things get out of hand..
As well, old posts sometimes get locked because new members bring back old topics that are more than a year old, and usually it follows by mods saying to make your own topic for your problem or whatever. You get the picture.
