Gambling is not at all a wrong thing. When it goes beyond a limit gambling will be simply wrong. You are getting profit or loss it should be stopped at a limit. There is not much of time spend on gambling which makes users addict.
The question whether gambling is wrong or not depends on a person's perspective. To some non-gamblers, gambling is not wrong nor right. They're neutral to it.
To others, it's wrong because they can lose their valued money from it.
To other people, it's good because they have fun and make a little to large profit from it.
To others such as casino owners and managers, it's good because they are making huge profit from gambling.