Then future downvotes won't affect your karma.

Who cares? The max amount of karma loss is 4 points, we can afford to eat our downvotes like adults.

Huh. I thought the minimum comment score was -4 (which would make the maximum amount of karma loss 5, since each comment starts at 1 point), but I didn't know if that was a cap on karma loss or just a cap on comment score.