राज्ञः सारथिः साहस्रः ॥ कZ_०५.३.२१ ॥
rājñaḥ sārathiḥ sāhasraḥ
The king’s charioteer is on the thousand-(paṇa) grade.
Proximity to the sovereign makes the role high-trust and high-risk; higher pay helps secure loyalty and competence in a security-critical position.