I certainly agree with reviving threads that still could be relevant instead of just rehashing all the same things over and over.
And we have an exact example as to why you just start a new thread and not necro old ones as it is very easy to not notice and have posters responding to month old posts. This is forums 101.
So you start a new thread so someone can just repeat themselves on a new thread instead of happening to repeat themselves on an old thread.
I'd say a little more thread necromancy and some search utilization and you wouldn't need hundreds of threads that are basically going over the same things over and over and over again.