For the purpose of my question, assume that the modern casinos have games which, on average, favor the house. They don't win every spin of the roulette wheel, nor every throw of the dice, but the games are designed such that at the end of the day, the casino always comes out ahead.
This is several questions, really:
- Consider my hypothetical friend Ploni. Ploni agrees with those opinions that a Jew is never allowed to gamble. Learning that modern casino games are designed so that the odds favor the house, and the casino is always ahead at the end of the day, he thinks this is a great business in which to invest, and he buys a casino. Does this make him a gambler?
- If the answer to #1 is no, assuming that his customers are all gentiles, is there any violation of halacha in facilitating the gambling of his customers?
- If the answer to #2 is no, then imagine a Jewish customers goes into that casino and gambles. By allowing this, has the Jewish casino owner committed an aveira?
- On a tangentially related note: So far as I know, a Jew is permitted to drive benefit from non kosher food like pork (thought not bassar v' chalav). So could Ploni buy a pig abattoir, and start selling pork products? If a Jew sinned by eating pork he bought from Ploni, has Ploni committed an aveira?