I fully disagree about not self upvoting comments and I upvote all my own comments at 10% to get them up the feed.
(If I wasn't allowed to do that I would have a reciprocal comment voting arrangement replacing that within hours!)
I also upvote each comment I reply to to keep the action happening. Been doing that for 10 months now...
What I'm wondering is - what do you think a good cap would be? I think it's possibly a good idea, and am thinking $1000.