I currently have 3 free and 7 pay novels up at various stores. My ratio of giveaways to paid sales has been pretty constant over the last two years at about 50:1. I tend to make the first book of a series free once the series is complete (I have one trilogy and one quadrilogy) and have noted that there is about a tenfold increase in sales of the paid books once the free one has been out for a while. My sales are fairly modest so the data points are small, but take that for what you will.
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