This is a very good point. As users of Adwords become more familair with its abilities to customize campaigns, they can spend less and keep their same conversi

This is a very good point. As users of Adwords become more familair with its abilities to customize campaigns, they can spend less and keep their same conversion rates. For instance, only advertising at certain times of day, or certain keywords for specific regions, not advertising in specific geographical locations, the use of quotes and brackets in keywords, etc...