Google suppport has confirmed to me that it is true that they do charge if the person clicks again on your Ad.
If I am watching TV and an Ad shows up, If I have recorded that program and if I watch the Ad several times from recording, I don't think that the Advertiser is being chraged for those ads.
If a person has not initiated a new search on Google and is clicking Ads from the same search results page, I don't think I should be paying for multiple clicks.
Sdani