I was thinking it could be used to run ads at the end of the month and end of the day when other campaigns start to run out of budget and rates tend to be lower.
I've noticed that after 5:00pm EST the PPC tends to go down on my AdSense ads and the PPC tends to go down during the last week or two of the month. I would assume this results in a corresponding drop in PPC costs to advertisers.
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