Well at the first place its safer and you can also make more money, gambling is really based on luck and you can than also lose everything at once.
in fact both trading and gambling are risky, but in trading we have a little advantage using your experience, because trading also depend on your previous experience and skill. while gambling depend on your luck and there is very little role of your skill and experience in gambling.
things make trading better is when you don't have to rely on luck only not just like gambling.
most games in gambling required luck to win it , it is useless to use strategy or having experience.
no wonder why people prefer to go trading instead to gamble.
Actually, people love to gamble than trade because to gamble is easier. People tend to be lazy and they do not want to do much or learn much in order to make money. They always want to earn easy money which is impossible. That's why they come to some casinos and gamble without thinking about anything on this planet.