How about this: I've configured Firefox with DNT and frequently, when I land on a site that blocks my view with a modal cookie popup, I just push the back button and try another link. While my browsing behaviour might be less typical than just pressing "OK", I'm sure it's a statistic they are keeping an eye on.

So while the dark pattern approach has merits to sites that want to track you, they must also be aware this is a balance. And a percentage of users will generally prefer to go to sites that leave them alone. That is: the cookie dialogue never widens the funnel.