Oh wow. That's just awful. So far, I haven't suffered that same fate with my content, but in looking at the numbers of offenders posted by the bots, it's somewhat staggering how many people are involved in IP appropriation to one degree or another. I have no idea how you could completely solve this problem, but perhaps just continuing to make the community as a whole aware of the situation like you did with this post will help direct steer more potential sales back to you. Good luck with your event!