The recently completed 2000 World Gaming Expo showcased a number of new table games, many of which will never make it into a casino near you. While most of these new games look like fun, their inventors are fighting an uphill battle because table space is getting more and more scarce on casino floors.
Slot machines are more profitable per square foot, and floor space is limited.
By putting any new table game on the floor, a casino is predicting that the new game will make more money for the casino than the game it replaced. That doesn't necessarily mean you should avoid new games, because a big house percentage is only part of the equation. The casino might put out a new game if its management thinks the game can attract more players or higher-limit players. Keno, for example, has a huge house edge, but it doesn't make much money for casinos because not enough people play it and very few play it for high stakes. Anytime the player must make a decision, there's a chance he'll make an incorrect decision.