For this reason the casino's are making good money. The addictive nature of gambling makes people come back for more.
Winners, comes back for more winnings of 'free money'
Losers, come back to re cope their lost bets.
Gambling is also a big business, where people are playing and someone is earning, it is a business for the Owner of the casinos, they invest their big amount and people like me and you are playing the gambling, sometime we win it but most of the time we lose it and when we lost so that amount is a earning for the casino.
You are right, gambling is not a charity foundation, why they give us only a winning ways.