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This may or may not be an issue for targeted attacks on high-profile individuals (which in turn likely have the means to avoid them). But I don't think crosslinking moderately-reliable browser identifiers across different websites, so as to be able to extort "average Joes", will really be that profitable.

Remeber that there's a lot of people watching porn and a lot of people on facebook-like sites, so those unique broswer identifiers won't be so unique any more in the end. Also there's a lot of money involved in both porn and facebook, so trying to meddle with them get you sued if you endager their profits.

The real issue I see however is credit card data and how easy it would be for corrupt authorities to abuse it. I looked into options for anonymous credit cards just because of this, but sadly that gets you into really shady money landering territory really quickly.