Yeah I don't get why you'd assume 4th year Mathematical Finance would be common knowledge. It still strikes me as knowingly condescending.

I don't agree that someone else has to lose in order to gain. That assumes zero growth, which is not the case.

I think people don't know what you're talking about because you seem to just be repeating stuff you heard in a lecture hall 10 years ago when the world is vastly more complicated.