It's very simple, what happened is that we should always try to reduce our interest for making profits or how we do see our analysis to come effectualization or actualization, that is why many people do not really care about how much they lose while gambling. But, I must say it's quite important to have less risky games or having less loses than keeping chasing winning or what we have already lose previous. Gambling is good and sweet but whenever you aren't gambling responsibly then I must say it's not a gambling rather a money doubling competition that you can never win due to desperacies or desperado.
It's very true, what happens is that accepting that turns out to be very difficult for many, everyone wants to win, it's okay to accept the losses and as a consequence we will have less money but the pleasure of having participated and won remains, personally these things go to another level, where the interest in winning is minimal and the interest in having fun is greater, that is difficult to achieve,
I think a millionaire achieves it quickly, but a normal person does not because all they want is to earn money.
You could be right and, I will also say that it's not as easily as we think because they are also lose money on the process, and who could be happy losing on the long run? Invariable no one because, everyone values their money and how much they are losing.
The important thing should be if they are actually playing with the amount they can afford to lose than an amount which is potentially high above their expectations with this, there could be no fun while gambling. The only difference between millionaire as you said is just that they wouldn't that affected because they have sufficiently enough than those who are trying to make gambling a source of livelihood.