Mine were not affiliate purchases either. I contacted all of the suspicious buyers, and none responded. And none contacted me, such as wondering why their purchase was immediately refunded, or stating that they had purchasing/ downloading issues.
I typically have about 1 buyer a month not download a book soon after they buy it, and I always am able to contact them, or they contact me, and we resolve it. Out of thousands of transactions, I have never had a legit buyer not receive the e-book either immediately or after some assistance, or not contact me when they had an issue with the process.
So when 14 strange transactions like this happen in a row, some type of scheme or scam is definitely going on.
And since it was 14 purchases of the same outdated ebook, some from the same IP address, which they never downloaded, I don't think they were after a free product. I still believe it is a PayPal chargeback scam in the making.
I don't believe they are using someone else's paypal account / email, as they are all "made up" fake looking emails of random letters, and all @msn.com, that were probably made up and registered as they went along. I'm sure PayPal could confirm that all of the PayPal accounts were created right before the purchase, but unfortunately PayPal is difficult to communicate with, and they just send generic replies to my inquiries.