The Vegas Strip blackjack oas generally are the same as traditional blackjack. The return-to-player is 99.65 percent, and a winning wager pays even money. You win what you wager – unless you get a blackjack. Then you typically win $3 for every $2 that you wager with a 3:2 winning blackjack hand. Some casinos might reduce that to 6:5, so it pays to pay attention to the house oas. If you make an insurance wager and it hits, you usually win double your wager at 2:1.