"plus in busy times"
At 10am ?? No pit boss around. I suspect he was the only player.

At 10am at the Palms for example, how many roulette tables would have minimum two stacks of $500 out?

When I played the time before last, just after you went home, and won the $1900, it was paid all in black as they had no $500 out. That was at a busy time.