There've been a few cases where the ransomware was not decryptable - sites like BleepingComputer frequently discuss which ransomware have been cracked by researchers, which are currently actively run and will provide keys and which are undecryptable and you shouldn't pay in any circumstances. Basically it just makes things more complicated, but people are still willing to pay if they can in their specific case and the one they're infected with is reported as regularly providing good keys.
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