Nobody has unlimited money

to continue gambling forever unless they are printing it

. There’s a clear difference in that some are disciplined about it. I don’t believe much in strategy, but it does work for some, while the majority just gamble irresponsibly.
Long-term gambling depends on the gambler themselves. Either they are addicted, or they are getting some income from gambling itself, but I think the addiction aspect accounts for the higher percentage. While we have those addicted, fun can still keep some gamblers engaged for a long time, especially if the casino provides what they need, but only a few do this particularly.