Actually, even if it is just recording conversions and not clicks or impressions, then it's still not possible to have more than 100% conversions. (In essence, everyone purchases.)
Mike, are you sure the ad you are looking at (or wherever that number comes from) isn't about increasing your conversion rate by 537% -- which would make more sense?
Teli said "increasing your conversion rate by 537%"
Yes that makes more sense to me too.
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