This stat includes everyone, some of them may not research what hit them. One of my clients decrypted his database twice, after seeing on the internet that they actually send a decryption key.
On the other hand the attacker may actually have incentive to follow through and hold up their end so as to build a reputation. Making their next victims more likely to just pay.
Somewhere I read that some ransomware had excellent "customer" service for helping you transfer over the payment and promptly restore your files.
