The problem is your down votes ruin the reputation score of high dollar investors. You don't need to 100% down vote to show the stats and your disagreement, nor do you need to down vote to an extent that a reputation score would be harmed.

IMO you would be better off doing the cheetah way of commenting on the post and giving a small down vote to show your displeasure without doing real harm. Your bots comments could bring light to the users abuse as being in the top XXX of vote abuse spam and you could gradually increase your flags to 100% instead of what you are doing now.