Can someone clarify this, or give me tips for optimization or perhaps notice somethng I'm doing wrong?
Thanks for reading
But, if you were to get 120 clicks at .10, you'd spend $12... so with a daily budget of only $5 you can't get the maximum number of impressions. The reason you don't see your ad with every search, then, is that the system attempts to display it only enough to stay near the daily budget.
As others have said, the Estimator is pretty inaccurate. There's really no way it can be completely accurate, since it can't judge how well your ads are written, how effective your headings are, etc.