> I mean really people, I hate to sound condescending, but... when you do a "buy one get one free" do you really think you got something for free?

To reiterate the parent comment: No, but we are paying a non-trivial fee for Prime membership every year. Is it unreasonable to have thought that part of that fee would go to offsetting shipping fees to the original seller?

I found your post informative in that, no, in fact it does not. That was definitely news to me. But no need to be condescending about it.