According to Google the average Salesforce employee makes $115,000/year, so double that and it's $230,000. By those numbers labor would be almost 50% of their revenue.
According to their most recent quarterly report, they had ~$16B in operating expenses on $23B in revenue through Q322. I would imagine a vast majority of opex is headcount.
Admittedly I'm not in the USA but even adjusting for that it still sounds large?
Are all US salaries so inflated that 424k doesn't more than cover a typical employee even after all overheads?