You can reduce your Google AdWords costs by doing other things than keyword research, landing page improvement and competitor analysis. In fact, some of the administrative sides of your Google AdWords campaign can help you lower the cost.
Why Google allows this cost reduction method to work, I do not know. But we’ve proven it time and again that your costs will go down. Determine your main AdWords keywords and create a new AdWords Campaign for each keyword. In that AdWords campaign, create a folder with that same keyword name. We believe this double use of the keyword on the administrative side somehow increases your relevancy score with Google.