Can we all just agree that this argument between you and Bart is pointless?
Karma farming is sighed over extensively at Reddit, who has to deal with exponentially more people than Skeptiko and is plagued by people pandering for likes/mobbing dislikes. Facebook only allows likes (and that still gets gamed.) Stack Overflow puts a social economy cost on dislikes (which kinda, you know, stop what Bart did from happening.)
The fact that Alex et all insist on keeping that module of Xenforo turned on, despite the widespread issues known about karma systems, means they simply don't care. There are bigger fish in the sea and that have languished over this same problem; you've got two options (the both of you):
1) Tell Alex to turn it off.
2) Deal with it.
The haven of the last forum was rarely used by either side.