The karma system on bulletin boards are there to give a general idea about if a person is liked or not by those who are a high enough level to rate people up or down. If you really care that much about it, start being more populist I guess.. Or do like the rest of us and just ignore it.. In all honesty, D-link staff has more pressing issues to tend to than the default built in Karma system.
But since you brought up the whole Karma thing.. Mods, Keep it. It serves it purpose well and works as indented.