Maybe you have missed one thing. Many people play gambling to lose money only.
LOL that slow burn. 
True that mate. Most people just play to lose money, ironically they came to make money but ended up busting their entire month's salary and gone broke as anything.
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This is a fact that people come in gambling to earn quick money or to spend their time having fun but in the end they just end up losing money. Only few people gain money from gambling and few are here to get fun only from gambling.
Few people are either jackpot winners who have stopped playing after that win because they were wise to know that the more you play the more you lose. Or it can be paid promotional content sponsored by the casinos for putting up on social channels. This black marketing also happens to draw in more traffic to the site.