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an adwords buyer I often set my content buy point at 1 penny because i've experienced low conversions with context ads. i still often get clicks even though i'm only spending a penny... so you can imagine if you are a webmaster hosting my ad and i'm only paying a penny ... you may get 0.
but as others have mentioned - the 0 cent clicks are usually just from clicks that Google has determined are invalid. maybe the same person clicking on it multiple times, that sort of thing.
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