In the piggy bank of options for consideration.
Voting for a profile to cancel as a class in view of its meaninglessness. Karma count as the sum of points for all comments. The number of votes cast per day is limited to a small number (2-30), depending on karma. Give out the first couple of votes with karma 10. And of course, hide the comment points in the thread before voting.
As far as I can see, many problems are solved in one fell swoop.
')
(For those who understand: almost full
copying of the karmic system Perlmonks.org , run-in for 7, it seems, years)