How would they send "good traffic" or "shit traffic" as you put it? Google is listing your site in results for search terms. This isn't like an adult traffic broker where you have no f-ing clue where such traffic originates - these are surfers searching for topics of interest.
It's possible that in natural Google fluctuations, your site does better with certain keywords so when those are ascendant your conversions increase (and vice versa) but I'm guessing what you're seeing is actually just normal statistical variation.
The moral of the story IMO is: don't pay attention to daily stats, even weekly is pushing it. You'll get a much better big picture with monthly increments. Why so many webmasters still obssess over short-term variations is a mystery to me - surely by now we're all experienced enough to know those rarely matter?
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DeltaofVenus.com - Vintage Erotica from the 1800s through 1979
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