Don't get me wrong, I actually agree with you. Many people use it for performance reasons, hence why I suggest that if BNS were to get some of the PERFORMANCE stuff incorperated into the game, it may eliminate some tool usage.
As a note, the devs of Multi Tool and Buddy would absolutely lose a lawsuit: NCSoft actually has a few ways they could go about it. Trademark infringement could be one of them, violation of the terms of service, or simply putting forth the theory that it loses them profits (lol).
But it absolutely would cost them far, far more then they'd ever gain from it. So they let it slide instead. Maybe they ban the odd person that's so blindingly obvious that even NCSoft's staff can read the logs and go 'that person is CHEATING', but there's some proof that no staff really knows how to manually read the server logs.