Who thinks casinos are symbols of greed and sin?

First of all, not all casinos are owned by a single person. Most of them are owned by corporations. And a lot of the casinos not only pay a government tax(State), but they also pay a tax to the local government, which in turn, uses the money for economic developement. Don't forget, that gambling has been around for almost as long as civilized man. Now, the casino trend is for a theme, to give the guest a different experience from the regular mundane feel of the regular casino. As for showing off the wealth and greed, that could be left for another debate, but those buildings cost millions of dollars, that the corporation has to take out in loans to build, which has to be repaid. Even though the casino has the odds in getting the money from their guest, the temptation of winning money, will always bring people into the casino.