Gambling isn't just for fun. Money is involved there, i do not think that "gambling should be just for fun" is applicable to everyone, especially to those people who got some of their money for living while playing on casinos.
This do not apply to all the gamblers because some players out there just play it as fun or entertainment purpose to releive their stress with small bets and cash out profits if they are lucky.Some are professional gamblers who took it as serious matter to play and involve various strategies and their experience to win as much big they can but also bear losses.Money matters that's right but it's just like lottery if you are lucky you can hit jackpot and if not you loose how much ticket costs you.So different scenarios different perspective of all players.Gambling addiction can lead to some serious damage which we as gamblers need to avoid.