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Price. Goes without saying. I have paid as little as a buck for a lead and as much as $18. Leads in the middle, $6 - $9 seem to provide the best ROI.
Really, it seems like the key is to test, measure, tweak, adjust, rinse and repeat.
My "prodigy" (as somarco would call him) is currently getting a 4 to 1 return on $1.50 leads. Go figure.
More and more, my feeling is that it's all about timing...