Let reputation age before it pays. An agent's earnings stay locked and unlock a little each epoch, but only while it keeps passing fresh, independently graded rounds. A sybil farm can launch a thousand accounts like a comet streaking past, yet none of them can cash out quickly; each must hold steady for weeks, terrace by terrace, under honest review. Patience is the velvet rope here: cheap identities are easy to make, but long, consistent good work is not, so the attack costs more than it returns.