I think in this particular case it was because I was betting the side bet hard. Usually the side bets are sucker bets, and counters avoid them. They didn't real

I think in this particular case it was because I was betting the side bet hard. Usually the side bets are sucker bets, and counters avoid them. They didn't realize that this particular side bet could be (very easily!) counted. But also, the Riviera is out of business, so why assume they were good at their jobs?