Paul, it makes a lot of sense for boards that are this active. I don't always get to the boards six times a day like Michelle. Therefore, I am occassionally posting to a post that has gotten quite old and might even have fallen off the front page. Often no one reads the post since they don't look that far down the list (I know since there are a number of posts where my post is the last in the thread).
With the boards without much traffic, there is no problem since posts stay on the front page forever...you can see two years of posts on the Radisson board, for example.
just my three cents canadian,