Here's a question you should be asking yourself about your PPC: Are the correct negatives being added to your account based on empirical analysis, and are precautions being made to make sure these negatives do not conflict with active keywords? As in, are you blocking the bad traffic with negative keywords based on real data? If not, consider what that's probably costing you in wasted ad spend. Just note that you don't want to throw in just any variation of keywords into the negative space because you don't want to create conflicts with the good working keywords. I had Simon help me out with this before. I'm sure he'd be willing to talk to you too if you just give him a ring at 208-806-2754 and tell him you need some help with your PPC campaigns.