Average Gambling Paybacks:
Blackjack -98%
Baccarat -98%
Craps (pass line) -98%
Pai Gow Poker -97.5%
Red Dog -97.5%
Sportsbook -95%
Video Poker -95%
Slot Machine -90%
Money Wheel -80%
Keno -80%
State Lotteries -50%
Bingo -50%

Don't be fooled that if a slot has a 90% payback, that will mean you will only lose 10% of your money. The 10% isn't off of your bankroll, but your action. If you were to start at a slot with $100, after one round your stash could be $90. After you put the $90 back in, you would be down to $81. On your third round you would lose on average another $8, and your stash would be down to $73. If the 10% was off your bankroll, you would have lost $10, but since it was off of your action, you would lose $27.

Blackjack and video poker are probably your best games if you just have a basic strategy. Games such as slots are alright if you want to go for the gold, and if you lose your bankroll doing it, it does't really hurt you.

Although games such as blackjack and video poker have about the same payback odds, don't be fooled there either. Video poker counts towards it's payback, hands that pay enormous jackpots that you will probably never see. That means that if you don't crack a royal or straight flush, chances are your playing a game that is nearly impossible to beat.