Analogscott,
I had the exact same question.
It seems completely logical to wonder if, by presenting the admin with a log many attempted “attacks,” WF hopes that you will buy the paid version.
I do not have a way to find out if this is a sales tactic, but I had the same thought. I have the P/U installed on one of my sites and each time I recv a warning email, so I just wonder…
For those critical of comments like mine, I beg you to consider that this is an honest inquiry, not a condemning of the p/u. It is not a “baseless” “conspiracy” theory, but an honest and sincere question.