It may be on a time out type deal.
They come in,
And the session stays active for a few minutes....
Were's John or Brink.
Im sure they would know more about that because im not sure how there forums are setup
But on my forums, Which is a dead project now.
Each IP had a session timer if it didn't do anything after a few minutes the session dropped.
Think of the bandwidth needed to keep an open session with each connection.
A few 100 people with a 1kbs stream can add up....