Just because Nexus has the best cabal imm... why you gotta pick on my sla-imean-mini-imean-members? Not my fault Knight is laaaaame. :P
But in all seriousness, I am not a fan of this for many reasons, not least of which being what FH brought up.
Another being that while we track character IPs, we don't attribute them to email addresses or even forum accounts. If we need to know, we look it up.
Also, some players have friends or family using the same IP to connect, so the metric available to us in game would result in erroneous emails being sent out to one of those players, as they would not be intended to receive it - since, let's be real, emailing ALL players anytime an area is taken would be an absurd amount of spam.
If you want information about the state of the game as it is running now, especially cabal warfare... log on and check.