I do agree with you about people needing to pay more attention. My issue here is that, even after 20+ years of internet availability, people still don't tend to understand what's going on a lot of the time. It's not that they're stupid or wilfully ignorant, mind you. It's more because there are a lot of idiosyncrasies online and you are often told, e.g. by support, to do something either opaque or outright nonsensical to a layperson, in order to make certain things work. I think, given that, it's very possible that people could see their cart had a $XX.XX item in it, and the statement that $XX.XX would be taken from their wallet, and still believe that the people actually performing the transaction were correct when they said to go ahead and complete the transaction for their free item. I mean, I've already seen reports of it, so clearly some people simply thought they were supposed to do as they were told. After all, those instructions were given by a multimillion dollar company that ought to know how to obtain its own products properly. It's not unreasonable to think they knew something that the buyer didn't about how the discount would work.