In my opinion, losing money is equally painful in both futures trading and slots. For example, if you deposit money in a casino and then lose it all on slots, you're unlikely to feel any enjoyment.
It's not healthy to look at casinos as money-making machines for players. They are making money, but for themselves, not for you. It's an entertainment industry that profits and makes a living from your losses with one important distinction from other sources of entertainment: you have a chance to win something every time you come to play. That's what's appealing about them. But the wins are far from guaranteed, especially with games with a high house edge like slots.