This is why casinos are the most profitable industry, many people are not playing to win, they all know that there is a house edge and they will eventually lose but based on the study, people are buying entertainment.
The first thing to note is that people don’t just gamble for the prospect of winning. Mark Griffiths, a psychologist at Nottingham Trent University who specializes in behavioral addictions points out that gamblers list a wide range of motivations for their habit.
Even when you’re losing while you’re gambling, your body is still producing adrenalin and endorphins – Mark Griffiths, Nottingham Trent University
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https://www.bbc.com/future/article/20160721-the-buzz-that-keeps-people-gamblingThis adrenalin and endorphins are what feed gamblers to gamble more without logical reason even to the point that they have no chance to win.
Many of us here will say that we are gambling for entertainment but this is the same reason why compulsive gamblers put in more money they want to feel high, so if you say I gamble for fun does this mean you admit you are buying entertainment to produce adrenalin and endorphins, so you keep on putting more money to get that feeling regardless if you win or lose.
Compulsive gambling is like drug intake you just don't get enough not until theirs nothing else (substance) to take in again. Whether adrenaline or not the feeling will always come to a halt immediately there's no more money to keep up with the gambling at the moment.