It's not the first time it was mentioned on the forums, just the first time in this thread. I believe it came up shortly after the start of w7 and we never found out if it was a real bug in coding, anti-griefing mechanic, or unintended consequence of the change to a hardcap on survival activities. Neither loftar nor jorb ever commented on the discussion. Also, nobody else could confirm how much more you could get from this.
viewtopic.php?f=4&t=33177