Do you want to execute actions as logged-in user on high-value website XXX ?

If yes -> very useful

Nobody is disputing that a wide variety of vulnerabilities are "useful", only that there's no market for most of them. I'd still urgently fix an XSS.

There is a market outside Zerodium, it's Telegram. Finding a buyer takes time and trust, but it has definitively higher value than 4k USD because of its real-world impact, no matter if it is technically lower on the CVSS scores.

Really? Tell me a story about someone selling an XSS vulnerability on Telegram.

("The CVSS chart"?)

Moments later

Why do people keep bringing up "Zerodium" as if it's a thing?

I understand your perspective about the technical value of an exploit, but I disagree with the concept that technical value = market value.

There are unorganized buyers who may be interested if they see potential to weaponize it.

In reality, if you want to maximize revenue, yes, you need to organize your own heist (if that's what you meant)

Do you know this or do you just think it should be true?

> understand your perspective about the technical value of an exploit

Going out on the world’s sturdiest limb and saying u/tptacek knows the technical and trading sides of exploits. (Read his bio.)