Fair point, difference between the two is undeniable. Having fun while playing casino games, just for the sake of having fun, can not be called gambling. Yet, how many people do it without having any hopes for scoring big? Tiny fraction of players display such approach.
Those can be described as bystanders, occasional or rather casual players. The rest 99.9% still counting on wining jackpot, or at least make even while having little thrill in the process. This would still be my stance as well, valid reason will be to experience the game, to play it.