You say that, but an entire spy ring got caught because they'd use consecutive passport numbers: https://thedebrief.org/russian-spy-successfully-infiltrated-nato-command-circles-reveals-stunning-report/

> Critically, Bellingcat and The Insider also exposed a massive GRU counterintelligence failure in that agency had been issuing consecutively numbered passports to its undercover spies. This meant that investigative journalists, foreign security agencies, or anyone for that matter, could acquire data frequently leaked onto Russia’s black market to uncover other embedded spies.

So it can be valuable, even when it's all fake