When Google gave me the information here, I found it invaluable. "Randoms" are just as entitled to access of information and enjoyment, as well as being a part of the forum community as "Elite-Upper-class" members who somehow see themselves as more worthy? <shrug>
If posts are closed, then the forums and search engine capability on providing information to help new players becomes something of a more exclusive content where new players have no idea whatsoever as to what the hell people are talking about.
Edit: Besides, when old posts are brought into the fore, it only serves as a multiplier on the forum itself, for bringing helpful information to new players who may be searching for this kind of information in the forums, so that they can get on with enjoying their game
I don't see how something like this deserves complaining about. If someone sees an old thread, and they already know the info, just move on.. why complain?