A fluctuation from 1:123 to 1:250 is not that wide a variation and you have only analyzed this data for 5 days. You should evaluate your ratios after a suitable time frame like 3-4 weeks worth. If you've ever done a statistics class, you'll know that you cannot compute a stable ratio until you have a larger population sample.
Until you do this, I wouldn't jump the gun so fast. I've had my bad days as well with as bad as 1:800 on premium SE traffic to as good as 1:40. Doesn't mean I'll drop the sponsor after seeing 1:800 in a 5 day span, you need to think longer term.
WG
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I play with Google.
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