If you reframe the perspective from 'free $500 sitting on a server' to 'requires actively utilizing an unreleased 0 day exploit on a server that will certainly be able to track exactly what was done, for a payout of... $500?'
That's pennies for something like this.
Add two zeros and it might get nabbed.
Edit: others have pointed out it's not really a 0-day anymore, they're right, so it's likely more a matter of time.