Depends on how much the casino is losing. Im pretty sure they got the odds in their favor too which could be considered "nitty" imo.
And don't think they won't quit you in Vegas! Ask Danny DiLiberto! He was stiffed by a casino in Vegas for $6500 on a bet at the casino's sports book on the Dogs. Danny had studdied the dogs for an entire season and made a pretty good score one day, the next day they took his bet, but when he won they said they thought he was cheating somehow and refused to pay. to this day he's never collected! And God Forbid if they think you're able to count cards! As long as you're losing in Vegas you're fine. If you figure out a way to beat the Casino at it's own game you'll either end up barred, behind bars or lost in the desert.