While it may feel counterintuitive, yes, it is standard etiquette to tip your dealer even if you are losing, though the frequency and amount can be significantly lower than when you are winning. Tipping is a way to acknowledge the dealer's skill, professionalism, and service, rather than just a "bonus" for your luck. In table games like Blackjack or Roulette, a common way to tip while losing is to "bet for the dealer" by placing a small chip ($1 or $5) in front of your own bet. If you lose, the house takes both; if you win, the dealer gets the winnings from their small bet as a tip. Most frequent gamblers will "color up" (exchange small chips for large ones) at the end of a session and leave a small token tip for the dealer even if they’ve had a bad run. However, if you are on a significant losing streak, it is perfectly acceptable to stop tipping until your luck turns or until you leave the table. The most important rule is never to blame or take your frustration out on the dealer; they have no control over the cards or the wheel, and being polite even when losing is the hallmark of a savvy player.