Anyone have any idea? I've seen some sites lately that seem to be archiving a history of prices, and I've also seen scripts which do just that.. How much faith in google do you have?
Google supposedly throws out bot traffic but sometimes it is hard to really tell but I would say their technology is pretty advanced in this field.
There are thousands of tools scraping data from Google, but don't worry about that. You can still make money and get plenty of traffic.
its a small enough percentage that you probably really shouldnt pay attention to it as the $5 credit is not going to make much difference. If your spending several million per month, then the credit can equal up to a few thousand per month.