You are right. Gambling should be played with the amount of money you are prepared to lose. Gambling for fun can keep you calm and relaxed in risky situations. This means that when you gamble for fun, making money will not be the main thing at that time, so the scope of gambling enjoyment will continue to expand and the risk of addiction will be less.
Gambling for fun can be a choice for some players who have a strong self control. And also a hassle to players who may not be interested in winning big, but found themselves wrestling with losses. The technical thing with gaming is the emotional connection it has on players for money's sake. Demo mode would have been the best place for fun gamers, yet it doesn't resonates the thrills with genuine gambling.
That emotional changes can be fun and bitter, depending on the angle of approach of a gambler. For sure, fun gambling is the good side of gambling, which helps to relax our nerves after a hectic day or busy schedule. However, controlling the feelings of losing money is a hard task to do, gamers only have one choice, to stop at the right moment especially when they're begining to lose their emotions and thoughts to gaming results.