Hmmm. I don't know. But I now plan to mention on twitter that SoC is free and how much I enjoyed reading it last year.
I do know that some bot-like entities from all over the world occasionally visit my website and then contact me to tell me I should advertise with them because 'their readers would enjoy my book.' Uruguay, Lithuania, etc, all over the world I get these mails within a day of a hit from there to my website. An America sounding name, usually, but the hit to the website is always somewhere remote. That has made me wonder what sorts of algorithms are out there weeding through free materials in the hopes of finding someone willing to pay money.
IOW, although I bet those downloads are readers (and maybe a boost from Amazon for the permafree?), there might be other things going on as well.
^^None of that really hangs together.
Color me puzzled.
Last thing--out of the blue I had two sales yesterday, which was after a dry spell, and I also don't know what to attribute it to although possibly something on twitter. But maybe it's a seasonal thing, people looking for christmas presents.