Yes it isn't wrong and there is nothing wrong with gambling. What is wrong is with the gamblers, if they can't take gambling lightly then gambling isn't the one is doing something wrong for them but it's themselves. We know what gambling can do to ourselves if we will take it seriously but always learn to do on how to make yourself control gambling, not gambling will control us.
You dont necessarily need to control your gambling habit. All you need to do is to have a determination that you are gambling for profit and you will stop when you got profit. Most people cant understand this stuff and keep on going whenever they feel like it, hoping that they will get more than what they intended to get
But since the amount of money you own is significantly less than the house, if you continue gambling forever you will eventually lose even if the house had no advantage at all over you.
The problem is that people never just stop forever. They might gamble once, make a profit and leave, but someday when they have a much larger amount of money, they're likely to come back and throw it all away, hoping they can get away with it. It's possible to control but it can be hard.