Earlier quoted context omitted.
Does it really matter if it's all fraud? You track 47 sales over some period. What was the ad spend for that period? Combine that with previous data and that should be enough to figure out if it was a successful campaign or not. When a company puts up a billboard or an ad on the bus, they don't care if the ad is seen by dashcams and dogs. All that matters is impact on the bottom line.
> Does it really matter if it's all fraud Uh, yes. If you get 47 sales on $10k in ad spend (pay per click) and $9900 of that $10k was fraudulent then you got 47 sales on $100 of ad spend. Imagine if you could stop those fraudulent clicks.
Your calculations make as much sense as pouring out 90% of a can of beer, claiming you have just made vodka, and simultaneously trying to pay only for the 10% of beer that is left.