I think this comment oversimplifies gambling addiction. Yes, chasing losses is a behaviour common to many gamblers, and yes, winning money provides an incentive to gamble in the first place, but many (most?) gambling addicts have different motivations.

Here are some quotes from _Addiction by Design_, by Natasha Dow Shüll -- a book I highly recommend if you're interested in this subject:

> Julie explains: "If it's a moderate day - win, lose, win, lose - you keep the same pace. But if you win big, it can prevent you from staying in the zone." [...] "You're not playing for money," says Julie, "you're playing for credit -- credit so you can sit there longer, which is the goal. It's not about winning, it's about continuing to play."

> [Pete says:] After sitting at the machine for fourteen hours, so tired I can barely keep my eyes open, no money in my pocket, no gas in my car, and no groceries at home, I still can't leave because I have four hundred credits in the machine. So I sit there for another hour until it's all gone, praying for me to lose: "Please God take this money so I can get up and go home." You might ask, "Why didn't you hit the cash out button?" That never occurred to me -- that was not an option.

I don't think the importance of the monetary payout is particularly clear-cut. The payin is what does the financial damage, by moving money out of the player's control. The incentives and reinforcement are what get the player hooked -- but perhaps those don't have to be financial? I won't discount the importance of the payout entirely; maybe it's critical to get hooked in the first place? But I also wouldn't be surprised if gambling addiction can arise in games which don't provide to ability to cash out.