I have pointed out before that transactions in a fair market benefit both buyer and seller, unless one is stealing from the other, and therefore create wealth. An "unfair market" is one in which a buyer or a seller has artificially precluded competitors, and thereby can command a lower than fair market price (if it is the buyer) or a higher one (if it is the seller). A monopoly or a labor union are examples of sellers who artificially preclude competitors. A monopsony is a buyer who precludes competitive purchasers. Transactions with these types of traders do not benefit their trading partners, at least as much as they would be benefitted in a fair market, because the monopolist or monopsonist is able to set a price that benefits itself more. Their trading partners still benefit to some degree, or else they would not trade. Because these artificial restraints on trade do not promote efficient allocation of wealth or wealth creation, they have been viewed as moral wrongs and outlawed since the Sherman Act was passed in 1890.
Other transactions similarly take advantage of one side of the bargain artificially to enrich the other, and therefore also do not create wealth. Selling drugs to an addict, for example, destroys the well-being of the purchaser and deprives him of wealth that could be put to productive use; this is not offset by the dealer's profit. Casinos also take advantage of addicts, but even when they don't, they do not create wealth. Taking money to play a game of chance, in which the odds are always in favor of the house, makes the casino owner rich, but paying it does not increase the well-being of the player, unless the player values the entertainment of playing the game more highly than what he loses by playing. Many people can't stop playing, however, or hope to recover losses with "just one more game," or truly are addicted to the thrill presented by the risk, and pay much more than they receive in entertainment. They are being robbed, but with their consent.
From a moral perspective, of course, recreational drugs and gambling are harmful to those who partake of them and to society in general, and therefore are rightly prohibited. But they also destroy wealth, and at a minimum government, for that reason, should not promote them. States and Indian nations that open or permit casinos for purposes of "economic revitalization" therefore have it completely backward. Casinos do not revitalize anything. By taking wealth from some (gamblers) and giving it to others (the casino owners), without making the gamblers economically better off, casinos engage in a form a wealth redistribution, making the poor poorer and the rich richer, but destroying wealth in the process.