The problem with that is it's more work for the mods (potentially a lot more) and is open to abuse or the appearance of abuse. Personally I don't see the problem with posting corrections/amendments after the fact... works just fine on usenet. Probably the best argument in favour of the status quo is that if you make a new post correcting an error or updating a for sale thread, it shows up as a new post which alerts everyone who's been following the thread that things have changed... editing an old post will only be noticed by the poster and thread necromancers.

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It's more appropriate to edit a for sale thread to indicate an item has been sold. Otherwise, you wind up with these very long threads with lots of tiny posts from one person:

"floppy drive is sold"

"CD drive is sold"

"hard drive is sold"

All of these extra posts serve to keep bumping the thread in the forum. Bumping more than every so often is considered rude. Or, you can have people posting one thread per item for sale, which is currently permitted but predicted to be banned soon.

The top post remains outdated and stagnant. Some users might read the thread, see only the top post and still PM someone about an item that has already been sold.

This is a forum, not a newspaper. Your posts should not have to be set in stone. This is also not USENET. It is a forum, with software capable of letting users edit their posts at any time. We should be able to take advantage of this feature.