It would appear that the creators of the web site are not even affiliated with the people who found or fixed the bug.

"Dirty COW is a community-maintained project for the bug otherwise known as CVE-2016-5195. It is not associated with the Linux Foundation, nor with the original discoverer of this vulnerability. If you would like to contribute go to GitHub."

Seems fishy.

Whenever I see something being sold for outrageous amounts of money (like some book on Amazon which can be bought new for $40, but some people are selling used for $1400) my first suspicion is: money laundering.

it's definitely a joke. everything in the store is overpriced, FAQ item "how can I uninstall linux" links to a video of a guy smashing a computer, etc. look at this FAQ item:

    What's with the stupid (logo|website|twitter|github account)?

    It would have been fantastic to eschew this ridiculousness,
    because we all make fun of branded vulnerabilities too, but
    this was not the right time to make that stand. So we
    created a website, an online shop, a twitter account, and
    used a logo that a professional designer created.

I think the author is just snarking about either branded vulnerabilities or the hype that this issue is getting. or both?