as is reputation is not a valid tool for self moderating a forum. Members complain if you disable "show who left reps" and they continuously create rep cliques who cricle rep each other, negative rep and retaliate with any who don't agree. We have it set up to "promote" members to a banned group once -25 rep is reached....this works well for obvious trolls..but once a member pads their score then it becomes in-affective.
For reputation to work it needs to be like a gas tank..full, empty, or anywhere in between. Once full those members should still be able to receive comments..but no more points. Also, with this system a member should only be able to rep a member once and then either delete that rep or change it. This would give a much better indication of the members true reputation in the forum.
There is a hack that enables the deleting/changing of rep points already so this should be a fairly easy fix.
https://vborg.vbsupport.ru/showthread.php?t=160783
Or use a user rating by dividing the rep/post count.
http://www.vbulletin.com/forum/showt...ht=user+rating