Actually, I would really take a look at the Keywords and what ads are showing. Assuming you use {Keyword} and insert it into the URL or Headers/Page, you should test at least some of the keyword and see what kind of ads you get, even if you are certain they are on focus! Just a couple of examples: MS office wasn't triggering office related ads, but would show medical keywords. MS Access would show Patent related ads. It's pretty obious no one looking for ms office * would actually click on these.