It happens at mine alot with one pit manager, but its also not until you do a player update when a guest is up $3-5k+. Most pits are just like ok, let me know if they get to 10
Its the $5-10 blackjack table with $500 on the layout among 3 players who are always like, they are bringing in the cooler etc at a dealer change
How much of it do you think is as a preventative measure to stop any collusion between dealer/player? It's obviously rare, but it does happen, and I would think it would be hard to detect if done minimally.
I.e. A dealer has a signal system that they'd only use once a week, where he will signal to a certain player on a big bet, information about his hole card. The dealer obviously must have a way to peek at his hole card... some dealers are better at this than others. They could change the signal every week, to make it even harder to detect.