I am unfortunately not very computer literate so I did a search for 'karma vBulletin' and came up with this among many others the search brought up, this may not be correct but others more better than me can do their own searches and find more info. As my Dad always tells me 'Get the facts first' 
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After weeks of testing we finally decides to release karma v2.
Hope you like it.
Features
1. Admin
- Set points for each
~ newthread
~ reply
~ points for thread owner if thread's view exceeded certain number.
~ extra points to user from admin/mod
~ extra points for thread owner if the thread's reply more than certain number.
~ search members by karma points.
~ create redeem items for members to redeem when they reach have enough karma points.
- Admin/Moderator can also add/delete points to user who posts useful thread or nonsense.
- Admin can set auto ban feature to on or off. If this feature is set to on, users' karma points that
exceed the negative point admin set to, will be banned from posting or replying threads.
2. User
- User can comment on other people's post and if they agree that post, the user will get karma points
for that. If user disagree with what they post, their karma points will be deducted.
- User can earn karma points when they post new thread, replies, many people view their thread, many
people reply their thread.
- User can also earn karma points from administrator or moderator if they post useful thread.
- Their points wil be deducted if they post nonsense.
- User can view the highest karma points members to lowest points.
- User can redeem items when they have enough karma points.
**********************************************
After weeks of testing we finally decides to release karma v2.
Hope you like it.
Features
1. Admin
- Set points for each
~ newthread
~ reply
~ points for thread owner if thread's view exceeded certain number.
~ extra points to user from admin/mod
~ extra points for thread owner if the thread's reply more than certain number.
~ search members by karma points.
~ create redeem items for members to redeem when they reach have enough karma points.
- Admin/Moderator can also add/delete points to user who posts useful thread or nonsense.
- Admin can set auto ban feature to on or off. If this feature is set to on, users' karma points that
exceed the negative point admin set to, will be banned from posting or replying threads.
2. User
- User can comment on other people's post and if they agree that post, the user will get karma points
for that. If user disagree with what they post, their karma points will be deducted.
- User can earn karma points when they post new thread, replies, many people view their thread, many
people reply their thread.
- User can also earn karma points from administrator or moderator if they post useful thread.
- Their points wil be deducted if they post nonsense.
- User can view the highest karma points members to lowest points.
- User can redeem items when they have enough karma points.