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> it's probably unique enough a subgroup to sell ads to

I have been browsing with JavaScript disabled by default for the past 6 months. Based on my experience, no-JavaScript ads are rarer than four-leaf clover.

More common than you think

https://amiunique.org/fpnojs

Probably not a representative sample though.

Also that cuts down the group so much, i imagine other things that are usually too coarse grained to be useful suddenly become much more useful. E.g. geoip location or accept-language headers.

> Figure in the user agent string and it's probably unique enough a subgroup to sell ads to.

But if you never see ads how do you sell ads to them and how do you meaningfully discover enough about the person to feed them valuable ads?

But ads don't work without javascript.