The thing is that when kids want to gamble, it's not for entertainment for sure. They want to make money from it and money only is what interests them here. It's adults who can(and must) be gambling for entertainment purposes. That's why before you are an adult, you shouldn't gamble.
You're right that's just the problem with kids under the age of gambling because unlike adult they see gambling in different perspectives which they believe they could win alot of money from it and before there parents will realize themselves the child will be out of control because the influence gambling has on kids is that it could make them to start thinking about doing illegal things just to get money and gamble, which is why is very important for parents to established a good interactive relationship with there children because it will help them to watch closely on there children by asking them about there friends and the kind of stuff they normally discuss on there school, and with this we can easily noticed the kind of influence there friends are having on them.