Maybe to get their post counts up? I seen another person revive an old post that has the same join date as googoochummer.
Five posts gives you access to PMs, 250 posts and 180 days of membership gets you to the Marketplace and 500 posts gets you an avatar, it is highly unlikely the resurrecting individual of this thread will ever return, as they often do. They register, post one post with already available information in an older, or even much older, thread, where that newly posted information has already been posted once or twice.
I do not see any spamming links in the signature, there are no hidden images in the post to get web traffic somewhere else and the behaviour is just strange to me.
I have asked dozens of such resurrectors, and never got a clear answer.
The only time, or it probably happens again today with another more subtle poster, I saw someone trying to get a higher post count, was someone being registered here for several months or even years and only having 50 or so posts. That member tried to get into the Marketplace and posted "countless" threads and even more posts within an hour, but got banned before reaching 230 posts.
Never seen that again in such massive explosion.
And I am off to bed now.