Directly advertising existential risk

Has anyone tried advertising existential risk?

Bostroms “End of Humanity” talk for instance.

It costs about 0.2 $ per view for a video ad on YouTube, so if 0.2% of viewers give an average of 100 $ it would break even. Hopefully people would give more than that.

You can target ads to groups likely to give much by the way, like the highly educated.

I posted this suggestion in the open thread as well, before I had the karma to make a thread. That okay?