If you come to a casino and take $25 an hour in EV and bring your friend who plays the nickel slots, the casino's still making money from both of you. Similarly, if you're winning $25 an hour in EV while there's someone flat betting purple, they won't want to back you off if that will also cause the whale to leave. If you win in blackjack and lose it back in other games, they'll let you play. Most places won't even watch someone betting red. But they know about the spotter/BP team approach, and someone flat betting the minimum who always has another person come in mid-shoe and bet purple at high counts only when he's playing will be watched.