I don't know what he pays them, but armed rent-a-cops around here get about $22 per hour. They're either "short" MPs, or cops close to retirement, looking at filling in the financial cracks before full-time retirement.
Usually only the shift supervisor is allowed to carry cocked-and-locked. Unless there's actual gunfire directed at them, the underlings have to wait for direct orders from their management to go hot. Illegal Mexicans with previous narco employment could be hired for at least $5/hour less, and they'd have much more trigger-time on different weapons from their earlier employers. I can't say they'd get many more hits, but their spray-and-pray style would give them a better chance.
Have any of these billionaires gone out with their troops to watch them in a live-fire exercise? Maybe fire some of the weapons themselves to get some idea of what's involved? Of course they still have to maintain their anti-gun creds, so they have to keep that stuff outside the media.
Around here, a couple of small, high-tech defense contractors hire top-notch proven operators by paying them 2x what the feds do for the best grade of contractors. And only on the recommendation of their current experienced operators. They also start the wining and dining a year before retirement, rather than getting a business card as they leave out-processing.
They have incipient knee, arm, and arthritis issues, but they're happy getting $500K per years while mostly sitting behind a desk, and watching the sensor system. They know they have at least one more ambush or infiltration left in them, at least, even if they'll have to use a cane after that. Meanwhile, they surf the internet while at work, looking for new gear and techniques that could improve the job. They also keep an eye on the "farm teams" for young talent with potential to advance faster than the government training syllabus would indicate.
More money, and less of a chance of being shipped to some fourth-world hellhole on short notice can be mighty appealing, especially if you are starting a family, and you can come home almost every night of the week. And don't have to paint the rocks white around your unit's area during a slow time.
Mr. Zuckerberg, are you sure you're getting the security you want for the money you're paying?