1. A friend told me a side bet loophole which could be won by cutting or counting in 2012. He won $550,000 in one day by cutting from the high limit. Cutting had high EV but requiring accuracy I thought. I arranged a team with counters and cutters. Cutters would come later. The team counted first waiting for cutters and won $100,000 which alerted the casino reducing max to 10% of original. I realized only then that, with 150% EV, cutting was more than times of counting thus needed not be accurate. I have missed perhaps $1 M!
Cutters arrived but I closed the team pissed and left regretting my mistake. All team members and new arriving cutters stayed playing the game for another 6 months before the casino closed the loopholes for good. It seemed I have missed another $1 M there should I kept the team and played the lowered limit.