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As the others said 310 clicks is far too small a sample to make any decisions on. It could be hit 311 and 312 might well be sales and then you're looking at 1:156. At least 5,000 clicks or, more statistically safe, 10,000 clicks to make any conclusions on that sponsor with that traffic source.
I also agree that you should experiement with other methods and other traffic sources to find out what works and what doesnt.
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